Stabilized polyolefin compositions comprising benzofuranones and hindered phenolic antioxidants

ABSTRACT

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus-containing benzofuranone compounds and iii) one or more hindered phenolic antioxidants are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a national phase of International Application No.PCT/US2018/040695, filed on Jul. 3, 2018, which claims the benefit ofEuropean Patent Application No. 17180079.0, filed on Jul. 6, 2017 andU.S. provisional application 62/691,199 filed on Jun. 28, 2018. Thecontents of these applications are hereby incorporated by reference intheir entirety.

The disclosure relates to polyolefin compositions comprising3-phenyl-benzofuran-2-one compounds containing phosphorus and certainhindered phenolic antioxidants. The polyolefin compositions exhibitexcellent color performance and enhanced thermal stability during meltprocessing.

Traditional phenolic/phosphite antioxidant blends have been usedsuccessfully for decades to provide good melt flow control andacceptable color maintenance to polyolefins. However, there is a growingdemand for lower color of polyolefin articles and improved colormaintenance.

SUMMARY

Accordingly, disclosed are polyolefin compositions comprising i) apolyolefin, ii) one or more phosphorus-containing benzofuranonecompounds and iii) one or more hindered phenolic antioxidants. Thephosphorus-containing benzofuranone compounds may be of formula I-p1,I-p2, I-o1, I-o2, I-m1 or I-m2, further described herein below. Alsodisclosed are additive compositions comprising the phosphorus-containingbenzofuranone compounds and the hindered phenolic antioxidants.

Also disclosed are methods of stabilizing a polyolefin againstdeleterious effects of heat, light and oxygen, the method comprisingincorporating into the polyolefin ii) one or more benzofuranonecompounds selected from the group consisting of formula I-p1, I-p2,I-o1, I-o2, I-ml and I-m2 and iii) one or more hindered phenolicantioxidants. Deleterious effects of heat, light and oxygen may lead toundesired color.

DETAILED DISCLOSURE

The 3-phenyl-benzofuran-2-one compounds containing phosphorus may be offormula I-p1, I-p2, I-o1, I-o2, I-m1 or I-m2 (also referred to herein as“benzofuran-2-one” or “benzofuranone” compounds).

wherein

X and Z are independently P or P=O; Y^(p), Y^(o) and Y^(m) are oxygen orrepresent a covalent bond;

when Y^(p), Y^(o) and Y^(m) are oxygen, R^(1p) represents one ofsubformulae II-p, II-o or II-m

R^(1o) represents one of subformulae II-o or II-m, R^(1m) representssubformula II-m, or R^(1p) together with R^(2p), R^(1o) together withR^(2o) and R^(1m) together with R^(2m) represent one of subformulae III,IV or V

or R^(1p), R¹⁰ and R^(1m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl,C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl,C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, orC₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p) representsone of subformulae II-p, II-o or II-m, R^(2o) represents one ofsubformulae II-o or II-m, R^(2m) represents subformula II-m, or R^(2p)together with R^(1p), R^(2o) together with R^(1o) and R^(2m) togetherwith R^(1m) represent one of subformulae III, IV or V, or R^(2p), R^(2o)and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, whichis interrupted by one or more oxygen atoms, or C₂-C₁₆-alkyl, which isinterrupted by one sulfur atom; when r, Y^(p), Y^(o) and Y^(m) representa covalent bond, R^(1p) represents one of subformulae II-p, II-o orII-m, R^(1o) represents one of subformulae II-o or II-m, R^(1m)represents subformula II-m, or

R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl,C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl,C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, orC₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p), R^(2o)and R^(m 2)are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, or halogen; R⁴, R⁵, R⁶and R⁷ are each independently hydrogen or C₁-C₈-alkyl, R^(p2), R^(p3),R^(p5) and R^(p6) are each independently hydrogen or C₁-C₈-alkyl,R^(o1), R^(o2), R^(o5) and R^(o6) are each independently hydrogen orC₁-C₈-alkyl,

R^(m1), R^(1m), R^(m5) and R^(m6) are each independently hydrogen orC₁-C₈-alkyl, R^(a1), R^(a2), R^(a3) and R^(a4) are each independentlyhydrogen or C₁-C₈-alkyl, R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) amdR^(b6) are each independently hydrogen or C₁-C₈-alkyl and R^(c1),R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₈-alkyl.

The one point of attachment at subformulae II-p, II-o or II-m is denotedby the end of the line which does not carry a character and is blank.The two points of attachment at subformulae III, IV or V are denotedeach by the end of the respective line which does not carry a characterand is blank. When R^(1p) together with R^(2p), R^(1o) together withR^(2o) and R^(1m) together with R^(2m) represent one of subformulae III,IV or V, then R^(2p) together with R^(1p), R^(2o) together with R^(1o)and R^(2m) together with R^(1m) represent the same subformula.

A compound of formula I-p1, I-p2, I-o1, I-o2, I-m1 or I-m2 possesses atleast one asymmetric carbon atom, i.e. a carbon atom at the 3-positionof the benzofuran-2-one structural unit. Further asymmetric carbon atomscan be present in alkyl substituents with at least four carbon atoms. Aphosphorus atom, which is substituted with three different substituents,can show a hindered inversion, which can lead dependent on temperatureto an asymmetric phosphorus atom. The invention relates to any one ofthese enantiomers, resulting diastereomers or mixtures thereof.

C₈-C₁₀-aryl, which is unsubstituted or substituted by C₁-C₈-alkyl,C₁-C₈-alkoxy, halogen or one phenyl, is for example phenyl,2-methyl-phenyl, 3-methyl-phenyl, 4-methyl-phenyl, 2,4-dimethyl-phenyl,3,5-dimethyl-phenyl, 4-(1,1-dimethylethyl)-phenyl,4-(1,1,3,3-tetramethylpentyl)-phenyl, naphthalen-1-yl, naphthalen-2-yl,6-methylnaphthalen-2-yl, 4-phenyl-phenyl, 2-methoxy-phenyl,3-methoxy-phenyl, 4-methoxy-phenyl, 2-ethoxyphenyl, 3-ethoxy-phenyl,3-(n-propoxy)-phenyl, 4-(1,1-dimethylethoxy)-phenyl, 2-chloro-phenyl,3-chlorophenyl, 4-chlorophenyl, 2-chloro-4-methylphenyl. In someembodiments, C₆-C₁₀-aryl is unsubstituted or substituted by C₁-C₈-alkylor C₁-C₈-alkoxy. In certain embodiments, aryl is phenyl which isunsubstituted or substituted by C₁-C₈-alkyl. In other embodiments, arylis phenyl.

C₁-C₈-alkyl is linear or branched and for example methyl, ethyl,n-propyl, 1-methyl-ethyl, n-butyl, 1-methyl-propyl, 2-methyl-propyl,1,1-dimethyl-ethyl, n-pentyl, 1-methyl-butyl, 3-methyl-butyl, n-hexyl,1-methyl-pentyl, 2-methyl-pentyl, 4-methyl-pentyl, 2-ethyl-butyl,n-heptyl, 1-methyl-hexyl, n-octyl, 1-methyl-heptyl, 2-ethyl-hexyl,5,5-dimethyl-hexyl or 1,1,3,3-tetramethyl-butyl. In some embodiments,alkyl is C₁-C₄-alkyl or C₈-alkyl, for example methyl, ethyl,1-methyl-ethyl, 1-methyl-propyl 1,1-dimethyl-ethyl or1,1,3,3-tetramethyl-butyl. In certain embodiments, alkyl is C₁-C₄-alkyl,such as methyl, ethyl, 1-methyl-ethyl, 1-methyl-propyl1,1-dimethyl-ethyl and in certain other embodiments is methyl,1-methyl-propyl or 1,1-dimethyl-ethyl.

C₁-C₈-alkoxy is linear or branched and for example methoxy, ethoxy,n-propoxy, 1-methyl-ethoxy, n-butoxy, 1-methyl-propoxy,1,1-dimethyl-ethoxy, n-pentoxy, 2-methyl-pentoxy, 2-ethyl-butoxy,1-methyl-hexoxy, n-octyloxy, 1-methyl-heptoxy, 2-ethyl-hexoxy,1,1,3,3-tetramethyl-butoxy. In some embodiments, alkoxy is C₁-C₄-alkoxysuch as methoxy.

Halogen is for example a fluorine atom (fluoro), chlorine atom (chloro),a bromine atom (bromo) or an iodine atom (iodo). In certain embodiments,halogen is a chlorine atom or a fluorine atom, in some embodiments,halogen is a fluorine atom.

C₁-C₁₈-alkyl is linear or branched and for example methyl, ethyl,n-propyl, 1-methyl-ethyl, n-butyl, 1-methyl-propyl, 2-methyl-propyl,1,1-dimethyl-ethyl, n-pentyl, 1-methyl-butyl, 3-methyl-butyl, n-hexyl,1-methyl-pentyl, 2-methyl-pentyl, 4-methyl-pentyl, 2-ethyl-butyl,n-heptyl, 1-methyl-hexyl, n-octyl, 1-methyl-heptyl, 2-ethyl-hexyl,5,5-dimethyl-hexyl, 1,1,3,3-tetramethyl-butyl, n-nonyl, 2-ethyl-heptyl,n-decyl, undecyl, n-dodecyl, tridecyl, tetradecyl, pentadecyl,n-hexadecyl or n-octadecyl. In some embodiments, C₁-C₁₈-alkyl is alinear or branched C₁-C₁₂-alkyl.

C₃-C₁₆-cycloalkyl is unsubstituted or substituted by C₁-C₄-alkyl and isfor example cyclobutyl, cyclopentyl, 3,4-dimethyl-cyclopentyl,cyclohexyl, 4-methyl-cyclohexyl, 4-(1-methylethyl)-cyclohexyl,4-(1,1-dimethylethyl)-cyclohexyl, 3,5-dimethyl-cyclohexyl,5-methyl-2-(1-methyl-ethyl)-cyclohexyl, cycloheptyl, cyclooctyl orcyclododecyl. In certain embodiments, C₃-C₁₆-cycloalkyl isC₅-C₇-cycloalkyl such as cyclohexyl.

C₇-C₁₃-aralkyl is for example benzyl, 4-methyl-benzyl, 2-phenyl-ethyl,3,5-dimethylbenzyl, 1-phenyl-1,1-dimethyl-methyl, 3-phenyl-propyl,3-phenyl-2-methyl-propyl, 3,5-di-tert-butyl-benzyl or4-phenyl-phenyl-methyl. In certain embodiments, aralkyl is benzyl.C₂-C₁₈-alkenyl is linear or branched and for example vinyl, allyl, Z- orE-but-2-ene-yl, or E-but-3-ene-yl, Z- or E-pent-2-ene-yl, pent-4-ene-yl,Z- or E-2-methyl-but-2-ene-yl, Z- or E-3-methyl-but-3-ene-yl, Z- orE-hex-1-ene-yl, Z- or E-hexadec-9-ene-yl or Z- or E-octadec-9-ene-yl,(9Z,12Z)-octadeca-9,12-diene-yl or (9Z,1 2Z,15Z)-octadeca-9,1 2,15-triene-yl. In certain embodiments, alkenyl is allyl.

C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, islinear or branched and for example methoxy-methyl, 2-methoxy-ethyl,2-ethoxy-ethyl, 2-(2-methoxy-ethoxy)-ethyl, 2-n-butoxy-ethyl,2-[2-(2-methoxy-ethoxy)-ethoxy]-ethyl,2-[2-[2-(2-methoxy-ethoxy)-ethoxy]-ethoxy]-ethyl,2-(2-methoxy-1-methyl-ethoxy)-1-methyl-ethyl, 3-(n-propoxy)-propyl,2-[2-[2-(2-n-butoxy-ethoxy)-ethoxy]-ethoxy]-ethyl,2-[(2-(2-n-butoxy-2-methyl-ethoxy)-2-methyl-ethoxy]-2-methyl-ethyl or2-[(2-n-lauryl)-ethoxy]-ethyl. In some embodiments, alkyl interrupted byone or more oxygen atoms is 2-methoxy-ethyl or 2-ethoxy-ethyl.

C₂-C₁₆-alkyl, which is interrupted by one sulfur atom, is linear orbranched and for example 2-(methyl-sulfanyl)-ethyl, 3-thiaundecyl or3-thiapentadecyl.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein R⁴ and R⁶ are hydrogen and R⁵ and R⁷ areeach independently hydrogen or C₁-C₈-alkyl, for example hydrogen orC₁-C₄-alkyl. In certain embodiments, R⁴, R⁶ and R⁷ are hydrogen and R⁵is hydrogen or C₁-C₈-alkyl, for example hydrogen or C₁-C₄-alkyl. In someembodiments, R^(p2) and R^(p6) are each independently hydrogen orC₁-alkyl, R^(p3) and R^(p5) are each independently hydrogen orC₁-C₄-alkyl, R^(o1) and R^(o6) are each independently hydrogen orC₁-C₈-alkyl, R^(o2) is hydrogen or C₁-alkyl and R^(o5) is hydrogen orC₁-C₄-alkyl, R^(m1) is hydrogen or C₁-alkyl, R^(m3) and R^(m5) are eachindependently hydrogen or C₁-C₄-alkyl and R^(m6) is hydrogen orC₁-C₈-alkyl.

In certain embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein Rp^(p2) and R^(p6) are hydrogen and R^(p3)and R^(p5) are each independently hydrogen or C₁-C₄-alkyl, R^(o1) ishydrogen or C₁-C₈-alkyl, R⁰² is hydrogen, R⁰⁵ and R^(o6) are eachindependently hydrogen or C₁-C₄-alkyl, R^(m1) and R^(m3) are hydrogen orC₁-alkyl, R^(m5) is hydrogen or C₁-C₃-alkyl and R^(m6) is hydrogen orC₁-C₈-alkyl. In other embodiments, R^(p2) and R^(p6) are hydrogen andRP³ and R^(p5) are each independently hydrogen or C₁-C₄-alkyl, whereinone of R^(p3) and R^(p5) is not C₄-alkyl, R^(o1) is hydrogen orC₁-C₈-alkyl, R^(o2) is hydrogen, R^(o5) is hydrogen or C₁-C₃-alkyl and

R^(o6) is hydrogen or C₁-C₄-alkyl and R^(m1) and R^(m3) are hydrogen orC₁-alkyl, R^(m5) is hydrogen or C₁-C₃-alkyl and R^(m6) is hydrogen orC₁-C₈-alkyl.

In some embodiments, R^(p2) and R^(p6) are hydrogen and one of R^(p3)and R^(p5) is hydrogen, whereas the other one is hydrogen orC₁-C₄-alkyl, R^(o1) is hydrogen or C₁-C₈-alkyl, R^(o2) is hydrogen,R^(o5) is hydrogen or C₁-alkyl and R^(o6) is hydrogen or C₁-C₄-alkyl andR^(m1), R^(m3) and R^(m5) are hydrogen and R^(m6) is hydrogen orC₁-C₈-alkyl. In certain embodiments, R^(a1), R^(a2), R^(a3) and R^(a4)are each independently hydrogen or C₁-C₄-alkyl, R^(b1), R^(b2), R^(b3),R^(b4), R^(b5) and R^(b6) are each independently hydrogen or C₁-C₄-alkyland R^(c1), R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₄-alkyl.

In some embodiments, R^(a1), R^(a2), R^(a3) and R^(a4) are eachindependently hydrogen or C₁-C₄-alkyl, R^(b1), R^(b2), R^(b3), R^(b4)are each independently hydrogen or C₁-C₄-alkyl and one of R^(b5) andR^(b6) is C₁-C₄-alkyl, whereas the other one is hydrogen and R^(c1),R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₄-alkyl. In certain embodiments, Y^(p), Y^(o) and Y^(m) are oxygenor represent a covalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen,R^(1p) represents one of subformulae II-p, II-o or II-m, R^(1o)represents one of subformulae II-o or II-m, R^(1m) represents subformulaII-m, or R^(1p) together with R^(2p), R^(1o) together with R^(2o) andR^(1m) together with R^(2m) represent one of subformulae III, IV or V,or R^(1p), R^(R1o) and R^(1m) are C₈-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl, C₃-C₁₈-cycloalkyl orC₂-C₁₈-alkenyl and R^(2p) represents one of subformulae II-p, II-o orII-m, R^(2o) represents one of subformulae II-o or II-m, R^(2m)represents subformula II-m, or R^(2p) together with R^(1p), R^(2o)together with R^(1o) and R^(2m) together with R^(1m) represent one ofsubformulae III, IV or V, or R^(2p), R^(2o) and R^(2m) are C₆-C₁₀-aryl,which is unsubstituted or substituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl,C₃-C₁₈-cycloalkyl or C₂-C₁₈-alkenyl; when Y^(p), Y^(o) and Y^(m)represent a covalent bond, R^(1p) represents one of subformulae II-p,II-o or II-m, R^(1o) represents one of subformulae II-o or II-m, R^(1m)represents subformula II-m, or R^(I)P, R^(1o) and R^(1m) areC₆-C₁₂-aryl, which is unsubstituted or substituted by C₁-C₈-alkyl,C₁-C₁₆-alkyl, C₃-C₁₆-cycloalkyl or C₂-C₁₈-alkenyl and R^(2p), R^(2o) andR^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or halogen, which is chloro or fluoro.

In some embodiments, Y^(p), Y^(o) and Y^(m) are oxygen or represent acovalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen, R^(1p) representssubformula II-p, R^(1o) represents the formulae II-o, R^(1m) representssubformula II-m, or R^(1p) together with R^(2p), R^(2o) together withR^(2o) and R^(1m) together with R^(2m) represent one of subformulae III,IV or V, or R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which isunsubstituted or substituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl or C₂-C₁₈-alkenyl and R^(2p) represents subformulaII-p, R^(2o) represents subformula II-o, R^(2m) represents subformulaII-m, or R^(2p) together with R^(1p), R^(2o) together with R^(1o) andR^(2m) together with R^(1m) represent one of subformulae III, IV or V,or R^(2p), R^(2o) and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl orC₂-C₁₈-alkenyl; when Y^(p), Y^(o) and Y^(m) represent a covalent bond,R^(1p) represents subformula II-p, R^(1o) represents subformulae II-o,R^(1m) represents subformula II-m, or R^(1p), R^(1o) and R^(1m) areC₆-C₁₀-aryl, which is unsubstituted or substituted by C₁-C₈-alkyl,C₁-C₁₈ -alkyl, C₃-C₁₆-cycloalkyl or C₂-C₁₈-alkenyl and R^(2p), R^(2o)and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or halogen, which is chloro or fluoro.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I -m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) are oxygen orrepresent a covalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen,R^(1p) represents subformula II-p, R^(1o) represents the formulae II-o,R^(1m) represents subformula II-m, or R^(1p) together with R^(2p),R^(1o) together with R^(2o) and R^(1m) together with R^(2m) representone of subformulae III, IV or V, or R^(1p), R^(1o) and R^(1m) areC₆-C₁₀-aryl, which is unsubstituted or substituted by C₁-C₈-alkyl,C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl or C₂-C₁₈-alkenyl and R^(2p) is R^(1p),R^(2o) is R^(1o), R^(2m) is R^(1m), or R^(2p) together with R^(1p),R^(2o) together with R^(1o) and R^(2m) together with R^(1m) representone of subformulae III, IV or V; when Y^(p), Y^(o) and Y^(m) represent acovalent bond, R^(1p) represents subformula II-p, R^(1o) representssubformulae II-o, R^(1m) represents subformula II-m and R^(2p), R^(2o)and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or halogen, which is chloro or fluoro.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) are oxygen orrepresent a covalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen,R^(1p) represents one of subformulae II-p, II-o or II-m, R^(1o)represents one of subformulae II-o or II-m, R^(1m) represents subformulaII-m, or R^(1p) together with R^(2p), R^(1o) together with R^(2o) andR^(1m) together with R^(2m) represent one of subformulae III, IV or V,or R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl and R^(2p)represents one of subformulae II-p, II-o or II-m, R^(2o) represents oneof subformulae II-o or II-m, R^(2m) represents subformula II-m, orR^(2p) together with R^(1p), R^(2o) together with R^(1o) and R^(2m)together with R^(1m) represent one of subformulae III, IV or V, orR^(2p), R^(2o) and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl; whenY^(p), Y^(o) and Y^(m) represent a covalent bond, R¹ represents one ofsubformulae II-p, II-o or II-m, R^(1o) represents one of subformulaeII-o or II-m, R^(1m) represents subformula II-m, or R^(1p), R^(1o) andR^(1m) _(are) C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl and R^(2p), R^(2o) andR²m are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl or fluoro.

In certain embodiments, Y^(p), Y^(o) and Y^(m) are oxygen or represent acovalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen, R¹ represents oneof subformulae II-p, II-o or II-m, R^(1o) represents one of subformulaeII-o or II-m, R^(1m) represents subformula II-m, or R¹ together withR^(2p), R^(1o) together with R^(2o) and R^(1m) together with R^(2m)represent subformula III, or R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl,which is unsubstituted or substituted by C₁-C₈-alkyl, or C₁-C₁₈-alkyland R^(2p) represents one of subformulae II-p, II-o or II-m, R^(2o)represents one of subformulae II-o or II-m, R^(2m) represents subformulaII-m, or R^(2p) together with R^(1p), R^(2o) together with R^(1o) andR^(2m) together with R^(1m) represent subformula III, or R^(2p), R^(2o)and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or C₁-C₁₈-alkyl; when Y^(p), Y^(o) and Y^(m) represent acovalent bond, R^(1p) represents one of subformulae II-p, II-o or II-m,R^(1o) represents one of subformulae II-o or II-m,

R^(1m) represent subformula or II-m, or R^(1p), R^(1o) and R^(1m) areC₆-C₁₀-aryl, which is unsubstituted or substituted by C₁-C₈-alkyl, orC₁-C₁₈-alkyl and R^(2p), R^(2o) and R^(2m) are C₆-C₁₀-aryl, which isunsubstituted or substituted by C₁-C₈-alkyl, or fluoro.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1, porI-o2, wherein Y^(p) and Y^(o) are oxygen or represent a covalent bond;when Y^(p) and Y^(o) and are oxygen, R^(1p), R^(2p), R^(1o) or R^(2o)does not represent subformula II-m; when Y^(p) and Y^(o) represent acovalent bond, R^(1p) or R^(1o) does not represent subformula II-m. Incertain embodiments in compounds of formula I-p1 or I-p2, Y^(p) isoxygen or represents a covalent bond; when Y^(p) is oxygen, R^(1p) orR^(2p) does not represent subformulae II-o or II-m; when Y^(p)represents a covalent bond, R^(1p) does not represent subformulae II-oor II-m.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) are oxygen orrepresent a covalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen, R¹represents one of subformulae II-p, II-o or II-m, R^(1o) represents oneof subformulae II-o or II-m, R^(1m) represents subformula II-m, orR^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl,C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl,C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, orC₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p) representsone of subformulae II-p, II-o or II-m, R^(2o) represents one ofsubformulae II-o or II-m, R^(2m) represents subformula II-m, or R²P,R^(2o) and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substitutedby C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, whichis interrupted by one or more oxygen atoms, or C₂-C_(m)-alkyl, which isinterrupted by one sulfur atom; when Y^(p), Y^(o) and Y^(m) represent acovalent bond, R^(1p) represents one of subformulae II-p, II-o or II-m,R^(1o) represents one of subformulae II-o or II-m, R^(1m) representssubformula II-m, or R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which isunsubstituted or substituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen orone phenyl, C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl,C₂-C₁₆-alkenyl, C₂-C₃₀-alkyl, which is interrupted by one or more oxygenatoms, or C₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p),R^(2o) and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted or substitutedby C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, or halogen.

In certain embodiments, the benzofuranones are of formula I-p1, I-p2,I-o1, I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) rare oxygen. Insome embodiments, the benzofuranones are of formula I-p or I-o, whereinY^(p) and Y^(o) are oxygen and R^(I)P, R²P, R^(1o) or R^(2o) does notrepresent subformula II-m. In other embodiments, benzofuranones are offormula I-p1, I-p2, I-o1, I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) andY^(m) are oxygen, R^(1p) together with R^(2p), R^(1o) together withR^(2o) and R^(1m) together with R^(2m) represent one of subformulae III,IV or V and R^(2p) together with R^(1p), R^(2o) together with R^(1o) andR^(2m) together with R^(1m) represent one of subformulae III, IV or V.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1 orI-o2, wherein Y^(p) and Y^(o) are oxygen, R^(1p) together with R²P andR^(1o) together with R^(2o) represent one of subformulae III, IV or Vand R²P together with R^(1p) and R^(2o) together with R^(1o) representone of subformulae III, IV or V. In certain embodiments, benzofuranonesare of formula I-p1 or I-p2, wherein Y^(p) is oxygen and R^(1p) togetherwith R^(2p) represent one of subformulae III, IV or V. In someembodiments, benzofuranones are of formula I-p, wherein Y^(p) is oxygenand R^(1p) together with R^(2p) represent subformula IV.

The above cited embodiments for compounds of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2 refer individually to the structural units of formulaI-p1, I-p2, I-o1, I-o2, I-m1 or I-m2 . These structural units comprisethe benzofuran-2-one unit including R⁴, R⁵, R⁶ and R⁷, the linkingphenylene unit including R^(p2), R^(p3), R^(p5), R^(p6), R^(o1), R^(o2),R^(o5), R^(o6), R^(m1), R^(m3), R^(m5) and R^(m6) and theother-close-to-phosphorus atom unit including R^(1p), R^(2p), R^(1o),R^(2o), R^(1m) and R^(2m) with substituents for subformulae III, IV orV, i.e. R^(a1), R^(a1), R^(a3), R^(a4), R^(b1), R^(b2), R^(b3), R^(b4),R^(b5), R^(b6), R^(c1), R^(c2), R^(c3) and R^(c4). The above citedembodiments for the three structural units can be combined. Examplesthereof are provided below.

In some embodiments, benzofuranones are formula I-p1, I-p2, I-o1, I-o2,I-m1 or I-m2 wherein Y^(p), Y^(o) and Y^(m) are oxygen or represent acovalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen, R^(1p) representsone of subformulae II-p, II-o or II-m, R^(1o) represents one ofsubformulae II-o or II-m, R^(1m) represents subformula II-m, or R^(1p)together with R^(2p), R^(1o) together with R^(2o) and R^(1m) togetherwith R^(2m) represent one of subformulae III, IV or V, or R^(1p), R^(1o)and R^(1m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-Cis-alkenyl, C₂-C₃₀-alkyl, whichis interrupted by one or more oxygen atoms, or C₂-C₁₆-alkyl, which isinterrupted by one sulfur atom, R²P represents one of subformulae II-p,II-o or II-m, R^(2o) represents one of subformulae II-o or II-m,

R^(2m) represents subformula II-m, or R²P together with R^(1p), R^(2o)together with R^(1o) and R^(2m) together with R^(1m) represent one ofsubformulae III, IV or V, or R²P, R^(2o) and R^(2o) are C₆-C₁₀-aryl,which is unsubstituted or substituted by C₁-C₈-alkyl, C₁-C₈-alkoxy,halogen or one phenyl, C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl,C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, which is interrupted by one or more oxygenatoms, or C₂-C₁₆-alkyl, which is interrupted by one sulfur atom; whenY^(p), Y^(o) and Y^(m) represent a covalent bond, R^(1p) represents oneof subformulae II-p, II-o or II-m, R^(1o) represents one of subformulaeII-o or II-m, R^(1m) represents subformula II-m, or R^(1p), R^(1o) andR^(1m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂ ⁻C₁₈-alkenyl, C₂-C₃₀-alkyl, whichis interrupted by one or more oxygen atoms, or C₂-C₁₆-alkyl, which isinterrupted by one sulfur atom, R²P, R^(2o) and R^(2m) are C₆-C₁₀-aryl,which is unsubstituted or substituted by C₁-C₈-alkyl, C₁-C₈-alkoxy,halogen or one phenyl, or halogen; R⁴ and R⁶ are hydrogen, R⁵ and R⁷ areeach independently hydrogen or C₁-C₈-alkyl, R^(p2) and R^(p6) are eachindependently hydrogen or C₁-alkyl, RP³ and RP⁵ are each independentlyhydrogen or C₁-C₄-alkyl, R^(o1) and R^(o2) are each independentlyhydrogen or C₁-C₈-alkyl, R^(o2) is hydrogen or C₁-alkyl, R^(o5) ishydrogen or C₁-C₄-alkyl, R^(m1) is hydrogen or C₁-alkyl, Rm³ and Rm⁵ areeach independently hydrogen or C₁-C₄-alkyl, R^(m6) is hydrogen orC₁-C₈-alkyl, R^(a1), R^(a2), R^(a3) and R^(a4) are each independentlyhydrogen or C₁-C₄-alkyl, R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) andR^(b6) are each independently hydrogen or C₁-C₄-alkyl and R^(c1),R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₄-alkyl.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) are oxygen orrepresent a covalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen,R^(1p) represents one of subformulae II-p, II-o or II-m, R^(1o)represents one of subformulae II-o or II-m, R^(1m) represent subformulaII-m, or R^(1p) together with R^(2p), R^(1o) together with R^(2o) andR^(1m) together with R^(2m) represent one of subformulae III, IV or V,or R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl, or C₃-C₁₆-cycloalkyl andR^(2p) represents one of subformulae II-p, II-o or II-m, R^(2o)represents one of subformulae II-o or II-m, R^(2m) represents subformulaII-m, or R^(2p) together with R^(1p), R^(2o) together with R^(1o) andR^(2m) together with R^(1m) represent one of subformulae III, IV or V,or R^(2p), R^(2o) and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl; whenY^(p), Y^(o) and Y^(m) represent a covalent bond, R^(1p) represents oneof subformulae II-p, II-o or II-m, R^(1o) represents one of subformulaeII-o or II-m, R^(1m) represents subformula II-m, or R^(1p), R^(1o) andR^(1m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl and R^(2p), R^(2o) andR²m are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or fluoro; R⁴, R⁵, R⁶ and R⁷ are each independentlyhydrogen or C₁-C₈-alkyl, R^(p2), R^(p3), R^(p5) and R^(p6) are eachindependently hydrogen or C₁-C₈-alkyl, R^(o1), R^(o2), R^(o5) and R^(o6)are each independently hydrogen or C₁-C₈-alkyl, R^(m1), R^(m3), R^(m5)and R^(m6) are each independently hydrogen or C₁-C₈-alkyl, R^(a1),R^(a2), R^(a3) and R^(a4) are each independently hydrogen orC₁-C₈-alkyl, R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) and R^(b6) are eachindependently hydrogen or C₁-C₈-alkyl and R^(c1), R^(c2), R^(c3) andR^(c4) are each independently hydrogen or C₁-C₈-alkyl.

In certain embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,or I-o2, wherein Y^(p) and Y^(o) are oxygen or represent a covalentbond; when Y^(p) and Y^(o) are oxygen, R^(1p) represents one ofsubformulae II-p or 11-0, R^(1o) represents subformulae II-o, or R^(1p)together with R^(2p) and R^(1o) together with R^(2o) represent one ofsubformulae III, IV or V, or R^(1p) and R^(1o) are C₆-C₁₀-aryl, which isunsubstituted or substituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen orone phenyl, C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl,C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, which is interrupted by one or more oxygenatoms, or C₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p)represents one of subformulae II-p or 11-0, R^(2o) representssubformulae II-o, or R^(2p) together with R^(1p) and R^(2o) togetherwith R^(1o) represent one of subformulae III, IV or V, or R^(2p) andR^(2o) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, whichis interrupted by one or more oxygen atoms, or C₂-C₁₆-alkyl, which isinterrupted by one sulfur atom; when Y^(p) and Y^(o) represent acovalent bond, R^(1p) represents one of subformulae II-p or 11-0, R^(1o)represents subformula II-o, or R^(1p) and R^(1o) are C₆-C₁₀-aryl, aryl,which is unsubstituted or substituted by C₁-C₈-alkyl, C₁-C₈-alkoxy,halogen or one phenyl, C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl,C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, which is interrupted by one or more oxygenatoms, or C₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p)and R^(2o) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₆-alkoxy, halogen or one phenyl, or halogen; R⁴, R⁵, R⁶and R⁷ are each independently hydrogen or C₁-C₆-alkyl, R^(p2), R^(p3),R^(p5) and R^(p6) are each independently hydrogen or C₁-C₈-alkyl,R^(o1), R^(o2), R^(o5) and R^(o6) are each independently hydrogen orC₁-C₈-alkyl, R^(a1), R^(a2), R^(a3) and R^(a4) are each independentlyhydrogen or C₁-C₈-alkyl, R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) andR^(b6) are each independently hydrogen or C₁-C₈-alkyl and R^(c1),R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₈-alkyl.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1, orI-o2, wherein Y^(p) and Y^(o) are oxygen or represent a covalent bond;when Y^(p) and Y^(o) are oxygen, R^(1p) represents one of subformulaeII-p or II-o, R^(1o) represents subformula II-o, or R^(p1) together withR^(2p) and R^(1o) together with R^(2o) represent subformula III, or RandR^(1o) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or C₁-C₁₈-alkyl, R^(2p) represents one of subformulae II-por II-o,

R^(2o) represents subformula II-o, or R^(2p) together with R^(1p) andR^(2o) together with R^(1o) represent subformula III, or R^(2p) andR^(2o) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₅-alkyl, or C₁-C₁₈-alkyl; when Y^(p) and Y^(o) represent a covalentbond, R^(1p) represents one of subformulae II-p or 11-0, R^(1o)represents subformula II-o, or R^(1p) and R^(1o) are C₆-C₁₀-aryl, whichis unsubstituted or substituted by C₁-C₈-alkyl, or C₁-C₁₈-alkyl, R^(2p)and R^(2o) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, or fluoro; R⁴ and R⁶ are hydrogen, R⁵ and R⁷ are eachindependently hydrogen or C₁-C₈-alkyl, R^(p2) and R^(p6) are hydrogen,R^(p3) and R^(p5) are each independently hydrogen or C₁-C₄-alkyl,wherein one of R^(p3) and R^(p5) is not C_(a)-alkyl, R^(o1) is hydrogenor C₁-C₈-alkyl, R^(o2) is hydrogen, R^(o5) is hydrogen or C₁-C₃-alkyl,R^(o6) is hydrogen or C₁-C₄-alkyl, R^(a1), Rae, R^(a3) and R^(a4) areeach independently hydrogen or C₁-C₄-alkyl, R^(b1), R^(b2), R^(b3),R^(b4), R^(b5) and R^(b6) are each independently hydrogen or C₁-C₄-alkyland R^(c1), R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₄-alkyl.

In other embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) are oxygen orrepresent a covalent bond; when Y^(p), Y^(o) and Y^(m) are oxygen,R^(1p) represents one of subformulae II-p, II-o or II-m R^(1o)represents one of subformulae II-o or II-m, R^(1m) represents subformulaII-m, or R^(1p), R^(1o) and R^(1m) are C₆-C₁₀-aryl, which isunsubstituted or substituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen orone phenyl, C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl,C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, which is interrupted by one or more oxygenatoms, or C₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p)represents one of subformulae II-p, II-o or II-m, R^(2o) represents oneof subformulae II-o or II-m, R^(2m) represents subformula II-m, or

R^(2p), R^(2o) and R^(2m) are C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl,C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl,C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, orC₂-C₁₆-alkyl, which is interrupted by one sulfur atom; when Y^(p), Y^(o)and Y^(m) represent a covalent bond, R^(1p) represents one ofsubformulae II-p, II-o or II-m, R^(1o) represents one of subformulaeII-o or II-m, R^(1m) represents subformula II-m, or R^(1p), R^(1o) andR^(1m) are C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl, C₃⁻C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, which isinterrupted by one or more oxygen atoms, or C₂-C₁₆-alkyl, which isinterrupted by one sulfur atom, R^(2p), R^(2o) and R^(2m) areC₆-C₁₀-aryl, which is unsubstituted or substituted by C₁-C₈-alkyl,C₁-C₈-alkoxy, halogen or one phenyl, or halogen; R⁴, R⁵, R⁶ and R⁷ areeach independently hydrogen or C₁-C₈-alkyl, R^(p2), R^(p3), R^(p5) andR^(p6) are each independently hydrogen or C₁-C₈-alkyl, R^(o1), R^(o2),R^(o5) and R^(o6) are each independently hydrogen or C₁-C₈-alkyl andR^(m1), R^(m3), R^(m5) and R^(m6) are each independently hydrogen orC₁-C₈-alkyl.

In some embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,I-o2, I-m1 or I-m2, wherein Y^(p), Y^(o) and Y^(m) are oxygen, R^(1p)together with R^(2p), R^(1o) together with R^(2o) and R^(1m) togetherwith R^(2m) represent one of subformulae III, IV or V, R^(2p) togetherwith R^(1p), R^(2o) together with R^(1o) and R^(2m) together with R^(1m)represent one of subformulae III, IV or V, R⁴, R⁵, R⁶ and R⁷ are eachindependently hydrogen or C₁-C₈-alkyl, R^(p2), R^(p3), R^(p5) and R^(p6)are each independently hydrogen or C₁-C₈-alkyl, R^(o1), R^(o2), R^(o5)and R^(o6) are each independently hydrogen or C₁-C₈-alkyl, R^(m1),R^(m3), R^(m5) and R^(m6) are each independently hydrogen orC₁-C₈-alkyl, R^(a1), R^(a2), R^(a3) and R^(a4) are each independentlyhydrogen or C₁-C₈-alkyl, R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) andR^(b6) are each independently hydrogen or C₁-C₈-alkyl and R^(c1),R^(c2), R^(c3) and R^(c4) are each independently hydrogen orC₁-C₈-alkyl.

In certain embodiments, benzofuranones are of formula I-p1, I-p2, I-o1,or I-o2, wherein Y^(p) and Y^(o) are oxygen, R^(1p) together with R^(2p)and R^(1o) together with R^(2o) represent one of subformulae III, IV orV, R^(2p) together with R^(1p) and R^(2o) together with R^(1o) representone of subformulae III, IV or V, R⁴, R⁵, R⁶ and R⁷ are eachindependently hydrogen or C₁-C₈-alkyl, R^(p2), R^(p3), R^(p5) and R^(p6)are each independently hydrogen or C₁-C₈-alkyl, R^(o1), R^(o2), R^(o5)and R^(o6) are each independently hydrogen or C₁-C₈-alkyl, R^(a1),R^(a2), R^(a3) and R^(a4) are each independently hydrogen orC₁-C₈-alkyl, R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) and R^(b6) are eachindependently hydrogen or C₁-C₈-alkyl and R^(c1), R^(c2), R^(c3) andR^(c4) are each independently hydrogen or C₁-C₈-alkyl.

In some embodiments, benzofuranones are of formula Ip1 or I-p2, whereinY^(p) is oxygen, R^(1p) together with R^(2p) represent one ofsubformulae III, IV or V, R⁴, R⁵, R⁶and R⁷are each independentlyhydrogen or C₁-C₈-alkyl, R^(p2), R^(p3), R^(p5)and R^(p6)are eachindependently hydrogen or C₁-C₈-alkyl, R^(a1), R^(a2), R^(a3) and R^(a4)are each independently hydrogen or C₁-C₈-alkyl, R^(b1), R^(b2), R^(b3),R^(b4), R^(b5) and R^(b6) are each independently hydrogen or C₁-C₈-alkyland R^(c1),

In some embodiments in benzofuranone compounds of formula I-p1 or I-p2,Y^(p) is oxygen, R^(1p) together with R^(2p) represent subformula IV,R⁴, R⁵, R⁶and R⁷are each independently hydrogen or C₁-C₈-alkyl, R^(p2),R^(p3), R^(p5) and R^(p6) are each independently hydrogen or C₁-C₈-alkyland R^(b1), R^(b2), R^(b3), R^(b4), R^(b5) and R^(b6) are eachindependently hydrogen or C₁-C₈-alkyl.

In some embodiments, benzofuranones are selected from compounds offormula (101)-(133).

The present benzofuranones may be prepared as disclosed inUS2017/0226323, US2017/0066905 and U.S. application Ser. No. 15/751497,published as WO2017/025431.

In certain embodiments, hindered phenolic antioxidants may bep-(3,5-di-tert-butyl-4-hydroxyphenyhpropionic acid esters, for instanceesters of mono- or polyhydric alcohols, for example with methanol,ethanol, n-octanol, i-octanol, a mixture of linear and branchedC₇-C₉-alkanol, octadecanol, a mixture of linear and branchedC₁₃-C₁₅-alkanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol,1,2-propanediol, 1,3-propanediol, neopentyl glycol,1,4-cyclohexanedimethanol, glycerol, thiodiethylene glycol, diethyleneglycol, triethylene glycol, pentaerythritol,tris(hydroxylethyl)isocyanurate, N,N′-bis-(hydroxyl-ethyl)oxamide,3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol,trimethylolpropane,4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

In other embodiments, hindered phenolic antioxidants includetris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate,1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene,the calcium salt of the monoethyl ester of3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid,1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazine,pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate,N,N′-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamamide),1,3,5-tris-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione,2,2′-methylenebis(4-methyl-6-tert-butylphenol)monoacrylate triethyleneglycol bis(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate,alpha-tocopherol or Vitamin E acetate.

Hindered phenolic antioxidants also include3-tert-butyl-4-hydroxy-5-methylphenyl groups in place of3,5-di-tert-butyl-4-hydroxyphenyl groups in any of the aboveantioxidants.

Alpha-tocopherol (synthetic Vitamin E) is racemic mixture of equalamounts of all eight possible stereoisomers of a-tocopherol (RRR, SSS,RRS, RSR, SSR, SRS, SRR, RSS). Synthetic Vitamin E is commonly referredto as dl-a-tocopherol or all-rac-alpha-tocopherol. Only one of thestereoisomers, 12, 5% of the total mixture, is RRR-alpha-tocopherol, theonly alpha-tocopherol stereoisomer occurring in natural Vitamin E. Theremaining seven stereoisomers in synthetic Vitamin E have differentmolecular configurations due to the manufacturing process.

The amount of benzofuranone stabilizers employed may range from any ofabout 20 ppm, about 30 ppm, about 40 ppm, about 50 ppm, about 60 ppm,about 70 ppm, about 80 ppm, about 90 ppm, about 100 ppm, about 110 ppm,about 120 ppm, about 130 ppm, about 140 ppm, about 150 ppm, about 160ppm, about 170 ppm, about 180 ppm, about 190 ppm, about 200 ppm, about250 ppm, about 300 ppm, about 350 ppm, about 400 ppm, about 450 ppm orabout 500 ppm to any of about 550 ppm, about 600 ppm, about 650 ppm,about 700 ppm, about 750 ppm, about 800 ppm, about 850 ppm, about 900ppm, about 950 ppm, about 1000 ppm, about 1050 ppm, about 1100 ppm,about 1150 ppm, about 1200 ppm, about 1250 ppm, about 1300 ppm, about1350 ppm or about 1400 ppm, by weight, based on the weight of thepolyolefin.

In other embodiments, the amount of present benzofuranone stabilizersemployed may range from any of about 0.05 wt % (weight percent), about0.07 wt %, about 0.09 wt %, about 0.10 wt %, about 0.15 wt %, about 0.20wt %, about 0.25 wt %, about 0.30 wt %, about 0.35 wt %, about 0.40 wt%, about 0.50 wt %, about 0.60 wt %, about 0.65 wt %, about 0.70 wt %,about 0.75 wt %, about 0.80 wt %, about 0.90 wt %, about 1.0 wt %, about1.3 wt %, about 1.5 wt %, about 1.7 wt %, about 2.0 wt %, about 2.5 wt%, about 3.0 wt %, about 3.5 wt %, about 4.0 wt %, about 4.5 wt %, about5.0 wt % or about 5.5 wt % to any of about 5.5 wt %, about 6.0 wt %,about 6.5 wt %, about 7.0 wt %, about 7.5 wt %, about 8.0 wt %, about8.5 wt %, about 9.0 wt %, about 9.5 wt % or about 10.0 wt %, based onthe weight of the polyolefin.

In other embodiments, the amount of present benzofuranone stabilizersmay range from any of about 1 wt %, about 5 wt %, about 10 wt %, about15 wt %, about 20 wt %, about 25 wt % or about 30 wt % to any of about35 wt %, about 40 wt %, about 45 wt % or about 50 wt %, based on theweight of the polyolefin.

The amount of hindered phenolic antioxidants may range from any of about20 ppm, about 30 ppm, about 40 ppm, about 50 ppm, about 60 ppm, about 70ppm, about 80 ppm, about 90 ppm, about 100 ppm, about 110 ppm, about 120ppm, about 130 ppm, about 140 ppm, about 150 ppm, about 160 ppm, about170 ppm, about 180 ppm, about 190 ppm, about 200 ppm, about 250 ppm,about 300 ppm, about 350 ppm, about 400 ppm, about 450 ppm or about 500ppm to any of about 550 ppm, about 600 ppm, about 650 ppm, about 700ppm, about 750 ppm, about 800 ppm, about 850 ppm, about 900 ppm, about950 ppm, about 1000 ppm, about 1050 ppm, about 1100 ppm, about 1150 ppm,about 1200 ppm, about 1250 ppm, about 1300 ppm, about 1350 ppm or about1400 ppm, by weight, based on the weight of the polyolefin.

In other embodiments, the amount of hindered phenolic antioxidantsemployed may range from any of about 0.05 wt % (weight percent), about0.07 wt %, about 0.09 wt %, about 0.10 wt %, about 0.15 wt %, about 0.20wt %, about 0.35 wt %, about 0.50 wt %, about 0.75 wt %, about 0.1 wt %,about 0.2 wt %, about 0.3 wt %, about 0.4 wt %, about 0.5 wt %, about0.6 wt %, about 0.7 wt %, about 0.8 wt %, about 0.9 wt %, about 1.0 wt%, about 1.3 wt %, about 1.5 wt %, about 1.7 wt %, about 2.0 wt %, about2.5 wt %, about 3.0 wt %, about 3.5 wt %, about 4.0 wt %, about 4.5 wt%, about 5.0 wt % or about 5.5 wt % to any of about 5.5 wt %, about 6.0wt %, about 6.5 wt %, about 7.0 wt %, about 7.5 wt %, about 8.0 wt %,about 8.5 wt %, about 9.0 wt %, about 9.5 wt % or about 10.0 wt %, basedon the weight of the polyolefin.

In some embodiments, one or more benzofuranones and one or more hinderedphenolic antioxidants may be employed in a weight/weight ratio of fromany one of about 1/99, about 1/90, about 1/80, about 1/70, about 1/60,about 1/50, about 1/40, about 1/30, about 1/20, about 1/10, about 1/9,about 1/8, about 1/7, about 1/6, about 1/5, about 1/4, about 1/3, about1/2 or about 1/1 to any one of about 2/1, about 3/1, about 4/1, about5/1, about 6/1, about 7/1, about 8/1, about 9/1, about 10/1, about 20/1,about 30/1, about 40/1, about 50/1, about 60/1, about 70/1, about 80/1,about 90/1 or about 99/1.

In some embodiments, hindered phenolic antioxidants are employed atequal or higher weight levels than the one or more benzofuranones. Forexample, in some embodiments, the weight/weight ratio of the one or morebenzofuranones to one or more hindered phenolic antioxidants may be fromany one of about 0.05, about 0.10, about 0.15, about 0.20, about 0.25,about 0.30, about 0.35, about 0.40, about 0.45 or about 0.50 to any oneof about 0.55, about 0.60, about 0.65, about 0.70, about 0.75, about0.80, about 0.85, about 0.90, about 0.95 or about 1.0.

Also disclosed are additive compositions comprising the one or morebenzofuranone compounds and the one or more hindered phenolicantioxidants. The weight/weight ratio of the benzofuranones to thephenolic antioxidants may be as above.

In some embodiments, the compositions may comprise one more additionaladditives selected from the group consisting of further antioxidants,organophosphorus stabilizers, hindered amine light stabilizers, acidscavengers, ultraviolet light absorbers, metal deactivators,hydroxylamines, nitrones, amine N-oxides, thiosynergists, peroxidescavengers, nucleating agents, fillers, flame retardants and antistaticagents.

In some embodiments, additional additives may include plasticizers,lubricants, emulsifiers, pigments, dyes, optical brighteners, rheologyadditives, catalysts, flow-control agents, slip agents, crosslinkingagents, crosslinking boosters, halogen scavengers, smoke inhibitors,antistatic agents or clarifiers such as substituted and unsubstitutedbisbenzylidene sorbitols.

Additional additives, individually or collectively, may range from anyof about 20 ppm, about 30 ppm, about 40 ppm, about 50 ppm, about 60 ppm,about 70 ppm, about 80 ppm, about 90 ppm, about 100 ppm, about 110 ppm,about 120 ppm, about 130 ppm, about 140 ppm, about 150 ppm, about 160ppm, about 170 ppm, about 180 ppm, about 190 ppm, about 200 ppm, about250 ppm, about 300 ppm, about 350 ppm, about 400 ppm, about 450 ppm orabout 500 ppm to any of about 550 ppm, about 600 ppm, about 650 ppm,about 700 ppm, about 750 ppm, about 800 ppm, about 850 ppm, about 900ppm, about 950 ppm, about 1000 ppm, about 1050 ppm, about 1100 ppm,about 1150 ppm, about 1200 ppm, about 1250 ppm, about 1300 ppm, about1350 ppm or about 1400 ppm, by weight, based on the weight of thepolyolefin.

In other embodiments, additional additives, individually orcollectively, may be employed from any of about 0.05 wt % (weightpercent), about 0.07 wt %, about 0.09 wt %, about 0.10 wt %, about 0.15wt %, about 0.20 wt %, about 0.35 wt %, about 0.50 wt %, about 0.75 wt%, about 0.1 wt %, about 0.2 wt %, about 0.3 wt %, about 0.4 wt %, about0.5 wt %, about 0.6 wt %, about 0.7 wt %, about 0.8 wt %, about 0.9 wt%, about 1.0 wt %, about 1.3 wt %, about 1.5 wt %, about 1.7 wt %, about2.0 wt %, about 2.5 wt %, about 3.0 wt %, about 3.5 wt %, about 4.0 wt%, about 4.5 wt %, about 5.0 wt % or about 5.5 wt % to any of about 5.5wt %, about 6.0 wt %, about 6.5 wt %, about 7.0 wt %, about 7.5 wt %,about 8.0 wt %, about 8.5 wt %, about 9.0 wt %, about 9.5 wt % or about10.0 wt %, based on the weight of the polyolefin.

Organophosphorus stabilizers include organic phosphite and organicphosphonite stabilizers and include for example triphenyl phosphite,diphenyl alkyl phosphites, phenyl dialkyl phosphites, tris(nonylphenyl)phosphite, trilauryl phosphite, trioctadecyl phosphite,tris(2,4-di-tert-butylphenyl) phosphite, tris-(2-sec-butylphenyl)phosphite (O), distearyl pentaerythritol diphosphite (F),bis(2,4-di-α-cumylphenyl) pentaerythrtitol diphosphite (K), diisodecylpentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite (D), bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite (E), bisisodecyloxy-pentaerythritoldiphosphite, bis(2,4-di-tert-butyl-6-methylphenyl) pentaerythritoldiphosphite, bis(2,4,6-tri-tert-butylphenyl) pentaerythritoldiphosphite, tristearyl sorbitol triphosphite, tetrakis(2,4-di-tert-butylphenyl) 4,4′-biphenylene-diphosphonite (H),6-isooctyloxy-2,4,8,10-tetra-tert-butyl-dibenzo[d,f][1,3,2]dioxaphosphepin(C),6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenzo[d,g][1,3,2]dioxaphosphocin(A), bis(2,4-di-tert-butyl-6-methylphenyl) methyl phosphite,bis(2,4-di-tert-butyl-6-methylphenyl) ethyl phosphite (G), 2,2′,2″-nitrilo[triethyltris(3,3′5,5′-tetra-tert-butyl-1,1′-biphenyl-2,2′-diyl)phosphite] (B), bis(2,4-di-t-butylphenyl) octylphosphite,poly(4,4′-{2,2′-dimethyl-5,5′-di-t-butylphenylsulfide-}octylphosphite),poly(4,4′{-isopropylidenediphenol}-octylphosphite),poly(4,4′-{isopropylidenebis[2,6-dibromophenol]}-octylphosphite),poly(4,4′-{2,2′-dimethyl-5,5′-di-t-butylphenylsulfide}-pentaerythrityldiphosphite), phosphorous acid, mixed 2,4-bis(1,1-dimethylpropyl)phenyland 4-(1,1-dimethylpropyl)phenyl triesters (CAS No. 939402-02-5),phosphorous acid, triphenyl ester, polymer withalpha-hydro-omega-hydroxypoly[oxy(methyl-1,2-ethanediyl)], C₁₀₋₁₆alkylesters (CAS No. 1227937-46-3),

In some embodiments, a combination of one or more organophosphorusstabilizers may be employed.

In certain embodiments, the organophosphorus stabilizer is selected fromthe group consisting of tris-nonylphenyl phosphite,bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite,bis(2,4-di-tert-butyl-6-methylphenyl) ethyl phosphite,2,2′,2″-nitrilo[triethyltris(3,3′5,5′-tetra-tert-butyl-1,1′-biphenyl-2,2′-diyl)phosphite], bis(2,4-di-α-cumylphenyl) pentaerythrtitol diphosphite,tris(2,4-di-tert-butylphenyl) phosphite and combinations thereof.

Hindered amine light stabilizers are, in some embodiments, compoundscontaining one or more moieties of formula

wherein R₁, R₂, R₃ and R₄ are independently methyl or ethyl and whereinR is H, methyl, hydroxy, propoxy, octyloxy, cyclohexyloxy, acyloxy orN-(2-hydroxy-2-methylpropoxy).

Suitable hindered amine light stabilizers are for example:

-   (1) 1-cyclohexyloxy-2,2,6,6-tetramethyl-4-octadecylaminopiperidine,-   (2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate,-   (3) bis(1-acetoxy-2,2,6,6-tetramethylpiperid in-4-yl) sebacate,-   (4) bis(1,2,2,6,6-pentamethylpiperidin-4-yl) sebacate,-   (5) bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate,-   (6) bis(1-octyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate;-   (7) bis(1-acyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate,-   (8) bis(1,2,2,6,6-pentamethyl-4-piperidyl)    n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate-   (9)    2,4-bis[(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-6-(2-hydroxyethyl    amino-s-triazine,-   (10) bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) adipate,-   (11)    2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-s-triazine,-   (12)    1-(2-hydroxy-2-methylpropoxy)-4-hydroxy-2,2,6,6-tetramethylpiperidine,-   (13)    1-(2-hydroxy-2-methylpropoxy)-4-oxo-2,2,6,6-tetramethylpiperidine,-   (14)    1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine,-   (15)    bis(1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl)    sebacate,-   (16)    bis(1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl)    adipate,-   (17)    2,4-bis{N-[1-(2-hydroxy-2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl]-N-butyl-amino}-6-(2-hydroxyethylamino)-s-triazine,-   (18) 4-benzoyl-2,2,6,6-tetramethylpiperidine,-   (19) di-(1,2,2,6,6-pentamethylpiperidin-4-yl)    p-methoxybenzylidenemalonate,-   (20) 2,2,6,6-tetramethylpiperidin-4-yloctadecanoate,-   (21) bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl) succinate,-   (22) 1,2,2,6,6-pentamethyl-4-aminopiperidine,-   (23)    2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro[4,5]decane,-   (24) tris(2,2,6,6-tetramethyl-4-piperidyl) nitrilotriacetate,-   (25)    tris(2-hydroxy-3-(amino-(2,2,6,6-tetramethylpiperidin-4-yl)propyl)    nitrilotriacetate,-   (26)    tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate,-   (27)    tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butane-tetracarboxylate,-   (28) 1,1′-(1,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone),-   (29)    3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decan-2,4-dione,-   (30)    8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,-   (31)    3-dodecyl-1-(2,2,6,6-tetramethyl-4-piperidyl)pyrrolidin-2,5-dione,-   (32)    3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione,-   (33)    N,N′-bis-formyl-N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine,-   (33a)    bis(1-undecanyloxy-2,2,6,6-tetramethylpiperidin-4-yl)carbonate,-   (34) reaction product of    2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl)butylamino]-6-chloro-5-triazine    with N,N′-bis(3-aminopropyl)ethylenediamine),-   (35) condensate of    1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and    succinic acid,-   (36) condensate of    N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and    4-tert-octylamino-2,6-dichloro-1,3,5-triazine,-   (37) condensate of    N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and    4-cyclohexylamino-2,6-dichloro-1,3,5-triazine,-   (38) condensate of    N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and    4-morpholino-2,6-dichloro-1,3,5-triazine,-   (39) condensate of    N,N′-bis-(1,2,2,6,6-pentamethyl-4-piperidyl)hexamethylenediamine and    4-morpholino-2,6-dichloro-1,3,5-triazine,-   (40) condensate of    2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1,3,5-triazine    and 1,2-bis(3-aminopropylamino)ethane,-   (41) condensate of    2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazine    and 1,2-bis-(3-aminopropylamino)ethane,-   (42) a reaction product of    7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro    [4,5]decane and epichlorohydrin,-   (43) poly[methyl,(3-oxy-(2,2,6,6-tetramethylpiperidin-4-yl)propyl)]    siloxane, CAS#182635-99-0,-   (44) reaction product of maleic acid    anhydride-C₁₈-C₂₂-α-olefin-copolymer with    2,2,6,6-tetramethyl-4-aminopiperidine,-   (45) oligomeric condensate of    4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and    2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine    end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,-   (46) oligomeric condensate of    4,4′-hexamethylenebis(amino-1,2,2,6,6-pentaamethyl-piperidine) and    2,4-dichloro-6-[(1,2,2,6,6-pentaamethylpiperidin-4-yl)butylamino]-s-triazine    end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,-   (47) oligomeric condensate of    4,4′-hexamethylenebis(amino-1-propoxy-2,2,6,6-tetramethyl    piperidine) and    2,4-dichloro-6-[(1-propoxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine    end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,-   (48) oligomeric condensate of    4,4′-hexamethylenebis(amino-1-acyloxy-2,2,6,6-tetramethyl    piperidine) and    2,4-dichloro-6-[(1-acyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine    end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine,-   (49) product obtained by reacting (a) with (b) where (a) is product    obtained by reacting 1,2-bis(3-aminopropylamino)ethane with cyanuric    chloride and (b) is (2,2,6,6-tetramethyl piperidin-4-yl)butylamine,-   (50) (4-piperidinol, 2,2,6,6-tetramethyl-1-(undecyloxy))-,    4,4′-carbonate and-   (51) 1,3,5-triazine-2,4,6-triamine,    N2,N2′-1,6-hexanediylbis[N4,N6-dibutyl-N2,N4,N6-tris(2,2,6,6-tetramethyl-4-piperidinyl)-,    N-propoxy.

Also included are the sterically hindered N—H, N-methyl, N-methoxy,N-hydroxy, N-propoxy, N-octyloxy, N-cyclohexyloxy, N-acyloxy andN-(2-hydroxy-2-methylpropoxy) analogues of any of the above mentionedcompounds. For example, replacing an N—H hindered amine with an N-methylhindered amine would be employing the N-methyl analogue in place of theN—H.

For illustrative purposes, some of the structures for the above-namedcompounds are shown below.

Thiosynergists include for example dilauryl thiodipropionate ordistearyl thiodipropionate.

Acid scavengers include hydrotalcites and amorphous basic aluminummagnesium carbonates, such as those described in U.S. Pat. Nos.4,427,816, 5,106,898 and 5,234,981. Hydrotalcite is also known ashycite, DHT4A, DHT4V, DHT4Z, DHT4A2 or DHT4C. Hydrotalcites are naturalor synthetic and may include a coating. Natural hydrotalcite is held topossess a structure Mg₆Al₂(OH)₁₆CO_(3.4) H₂O. A typical empiricalformula of a synthetic hydrotalcite isAl₂Mg_(4.35)OH_(11.36)CO_(3(1.67)).xH₂O. Examples of the syntheticproduct include Mg_(0.7)Al_(0.3)(OH)₂(CO₃)_(0.15).0.54 H₂O,Mg_(4.5)Al₂(OH)₁₃CO₃.3.5H₂O and Mg_(4.2)Al₂(OH)_(12.4)CO₃.

In some embodiments, acid scavengers include metal salts of fatty acids,for example alkali or alkali earth metal salts of fatty acids. In someembodiments, acid scavengers include calcium, magnesium, zinc, sodium,potassium or aluminum salts of fatty acids. In some embodiments, acidscavengers include calcium, magnesium, zinc, sodium, potassium oraluminum stearate, behenate, ricinoleate or palmitate. In certainembodiments, acid scavengers include calcium stearate, zinc stearate,magnesium behenate, magnesium stearate, sodium ricinoleate and potassiumpalmitate. In other embodiments, acid scavengers include zinc oxide.

In some embodiments, a combination of one or more acid scavengers may beemployed.

Ultraviolet (UV) light absorbers may be selected from the groupconsisting of hydroxyphenylbenzotriazole, tris-aryl-s-triazine,hydroxybenzoate, 2-hydroxybenzophenone and cyanoacrylate ultravioletlight absorbers (UVAs).

Hydroxyphenylbenzotriazole UVAs may include those disclosed in U.S. Pat.Nos. 3,004,896; 3,055,896; 3,072,585; 3,074,910; 3,189,615; 3,218,332;3,230,194; 4,127,586; 4,226,763; 4,275,004; 4,278,589; 4,315,848;4,347,180; 4,383,863; 4,675,352; 4,681,905, 4,853,471; 5,268,450;5,278,314; 5,280,124; 5,319,091; 5,410,071; 5,436,349; 5,516,914;5,554,760; 5,563,242; 5,574,166; 5,607,987, 5,977,219 and 6,166,218,such as 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole,2-(3,5-di-t-butyl-2-hydroxyphenyl)-2H-benzotriazole,2-(2-hydroxy-5-t-butylphenyl)-2H-benzotriazole,2-(2-hydroxy-5-t-octylphenyl)-2H-benzotriazole,5-chloro-2-(3,5-di-t-butyl-2-hydroxyphenyl)-2H-benzotriazole,5-chloro-2-(3-t-butyl-2-hydroxy-5-methylphenyl)-2H-benzotriazole,2-(3-sec-butyl-5-t-butyl-2-hydroxyphenyl)-2H-benzotriazole,2-(2-hydroxy-4-octyloxyphenyl)-2H-benzotriazole,2-(3,5-di-t-amyl-2-hydroxyphenyl)-2H-benzotriazole,2-(3,5-bis-α-cumyl-2-hydroxyphenyl)-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-(ω-hydroxy-octa-(ethyleneoxy)carbonyl-ethyl)-,phenyl)-2H-benzotriazole,2-(3-dodecyl-2-hydroxy-5-methylphenyl)-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-octyloxycarbonypethylphenyl)-2H-benzotriazole,dodecylated 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-octyloxycarbonylethyl)phenyl)-5-chloro-2H-benzotriazole,2-(3-tert-butyl-5-(2-(2-ethylhexyloxy)-carbonylethyl)-2-hydroxyphenyl)-5-chloro-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-methoxycarbonylethyl)phenyl)-5-chloro-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-methoxycarbonylethyl)phenyl)-2H-benzotriazole,2-(3-t-butyl-5-(2-(2-ethylhexyloxy)carbonylethyl)-2-hydroxyphenyl)-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-isooctyloxycarbonylethyl)phenyl-2H-benzotriazole,2,2′-methylene-bis(4-t-octyl-(6-2H-benzotriazol-2-yl)phenol),2-(2-hydroxy-3-α-cumyl-5-t-octylphenyl)-2H-benzotriazole,2-(2-hydroxy-3-t-octyl-5-α-cumylphenyl)-2H-benzotriazole,5-fluoro-2-(2-hydroxy-3,5-di-α-cumyl-phenyl)-2H-benzotriazole,5-chloro-2-(2-hydroxy-3,5-di-α-cumylphenyl)-2H-benzotriazole,5-chloro-2-(2-hydroxy-3-α-cumyl-5-t-octylphenyl)-2H-benzotriazole,2-(3-t-butyl-2-hydroxy-5-(2-isooctyloxycarbonylethyl)phenyl)-5-chloro-2H-benzotriazole,5-trifluoromethyl-2-(2-hydroxy-3-α-cumyl-5-t-octylphenyl)-2H-benzotriazole,5-trifluoromethyl-2-(2-hydroxy-5-t-octylphenyl)-2H-benzotriazole,5-trifluoromethyl-2-(2-hydroxy-3,5-di-t-octylphenyl)-2H-benzo-triazole,methyl3-(5-trifluoromethyl-2H-benzotriazol-2-yl)-5-t-butyl-4-hydroxy-hydrocinnamate,5-butylsulfonyl-2-(2-hydroxy-3-α-cumyl-5-t-octylphenyI)-2H-benzotriazole,5-trifluoromethyl-2-(2-hydroxy-3-α-cumyl-5-t-butylphenyI)-2H-benzotriazole,5-trifluoroethyl-2-(2-hydroxy-3,5-di-t-butylphenyl)-2H-benzotriazole,5-trifluoromethyl-2-(2-hydroxy-3,5-di-a-cumylphenyl)-2H-benzotriazole,5-butylsulfonyl-2-(2-hydroxy-3,5-di-t-butyl-phenyl)-2H-benzotriazole and5-phenylsulfonyl-2-(2-hydroxy-3,5-di-t-butylphenyl)-2H-benzotriazole.

Tris-aryl-s-triazine UVAs may include those disclosed in U.S. Pat. Nos.3,843,371; 4,619,956; 4,740,542; 5,096,489; 5,106,891; 5,298,067;5,300,414; 5,354,794; 5,461,151; 5,476,937; 5,489,503; 5,543,518;5,556,973; 5,597,854; 5,681,955; 5,726,309; 5,736,597; 5,942,626;5,959,008; 5,998,116; 6,013,704; 6,060,543; 6,242,598 and 6,255,483, andUS published application nos. 2015/329684 and 2017/327475, for example2,4,6-tris(2-hydroxy-3-methyl-4-hexyloxyphenyl)-1,3,5-triazine,dodecanedioic acid,1,12-bis[2-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)-3-hydroxyphenoxy]ethyl]ester,4,6-bis-(2,4-dimethylphenyl)-2-(2-hydroxy-4-octyloxyphenyl)-s-triazine,CYASORB 1164,4,6-bis-(2,4-dimethylphenyI)-2-(2,4-dihydroxyphenyl)-s-triazine,2,4-bis(2,4-dihydroxyphenyl)-6-(4-chlorophenyl)-s-triazine,2,4-bis[2-hydroxy-4-(2-hydroxy-ethoxy)phenyl]-6-(4-chlorophenyl)-s-triazine,2,4-bis[2-hydroxy-4-(2-hydroxy-4-(2-hydroxy-ethoxy)phenyl]-6-(2,4-dimethylphenyl)-s-triazine,2,4-bis[2-hydroxy-4-(2-hydroxyethoxy)-phenyl]-6-(4-bromophenyl)-s-triazine,2,4-bis[2-hydroxy-4-(2-acetoxyethoxy)phenyI]-6-(4-chlorophenyl)-s-triazine,2,4-bis(2,4-dihydroxyphenyl)-6-(2,4-dimethylphenyl)-s-triazine,2,4-bis(4-biphenylyl)-6-(2-hydroxy-4-octyloxycarbonylethylideneoxyphenyl)-s-triazine,2-phenyl-4-[2-hydroxy-4-(3-sec-butyloxy-2-hydroxypropyloxy)phenyl]-642-hydroxy-4-(3-sec-amyloxy-2-hydroxypropyloxy)phenylFs-triazine,2,4-bis(2,4-dimethylphenyl)-642-hydroxy-4-(3-benzyloxy-2-hydroxypropyloxy)phenylFs-triazine,2,4-bis(2-hydroxy-4-n-butyloxyphenyl)-6-(2,4-di-n-butyloxyphenyl)-s-triazine,2,4-bis(2,4-dimethylphenyl)-6-[2-hydroxy-4-(3-nonyloxy*-2-hydroxypropyloxy)-5-α-cumylphenyl]-s-triazine(* denotes a mixture of octyloxy, nonyloxy and decyloxy groups),methylenebis-{2,4-bis(2,4-dimethylphenyl)-6-[2-hydroxy-4-(3-butyloxy-2-hydroxypropoxy)phenyl]-s-triazine},methylene bridged dimer mixture bridged in the 3:5′, 5:5′ and 3:3′positions in a 5:4:1 ratio,2,4,6-tris(2-hydroxy-4-isooctyloxycarbonyliso-propylideneoxyphenyl)-s-triazine,2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-hexyloxy-5-a-cumylphenyl)-s-triazine,2-(2,4,6-trimethylphenyl)-4,6-bis[2-hydroxy-4-(3-butyloxy-2-hydroxy-propyloxy)phenyl]-s-triazine,2,4,6-tris[2-hydroxy-4-(3-sec-butyloxy-2-hydroxypropyloxy)-phenyl]-s-triazine,mixture of4,6-bis-(2,4-dimethylphenyI)-2-(2-hydroxy-4-(3-dodecyloxy-2-hydroxypropoxy)-phenyl)-s-triazineand4,6-bis-(2,4-dimethylphenyl)-2-(2-hydroxy-4-(3-tridecyloxy-2-hydroxypropoxy)-phenyl)-s-triazine,TINUVIN 400,4,6-bis-(2,4-dimethyl-phenyl)-2-(2-hydroxy-4-(3-(2-ethylhexyloxy)-2-hydroxypropoxy)-phenyl)-s-triazineand 4,6-diphenyl-2-(4-hexyloxy-2-hydroxyphenyl)-s-triazine.

Hydroxybenzoate UV absorbers may include for instance esters ofsubstituted and unsubstituted benzoic acids, as for example4-tert-butylphenyl salicylate, phenyl salicylate, octylphenylsalicylate, dibenzoyl resorcinol, bis(4-tert-butylbenzoyl) resorcinol,benzoyl resorcinol, 2,4-di-tert-butylphenyl3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl3,5-di-tert-butyl-4-hydroxybenzoate.

2-Hydroxybenzophenone UV absorbers include for example the 4-hydroxy,4-methoxy, 4-octyloxy, 4-decyloxy, 4-dodecyloxy, 4-benzyloxy, 4,2′,4′-trihydroxy and 2′-hydroxy-4,4′-dimethoxy derivatives.

Cyanoacrylate UV absorbers include for instance pentaerythritoltetrakis(2-cyano-3,3-diphenylacrylate), α-cyano-β,β-diphenylacrylic acidethyl ester or isooctyl ester and α-cyano-β-methyl-p-methoxy-cinnamicacid methyl ester or butyl ester.

In some embodiments, the UVA may include5-chloro-2-(3-t-butyl-2-hydroxy-5-methylphenyl)-2H-benzotriazole,2-(3,5-bis-a-cumyl-2-hydroxyphenyl)-2H-benzotriazole,4,6-diphenyl-2-(4-hexyloxy-2-hydroxyphenyl)-s-triazine,4,6-bis-(2,4-dimethylphenyl)-2-(2-hydroxy-4-octyloxyphenyl)-s-triazine,hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate or4-octyloxy-2-hydroxybenzophenone.

Many of the UVAs are commercial, for example TINUVIN 326, TINUVIN 234,TINUVIN 1577, TINUVIN 1600, CYASORB UV 1164, CYASORB THT, CYASORB UV2908, CHIMASSORB 81, UVINUL 3030, ADK LA-F70, ADK LA-1000, TINUVIN 400,etc.

Hydroxylamine stabilizers may include for exampleN,N-dibenzylhydroxylamine, N,N-diethylhydroxylamine,N,N-dioctylhydroxylamine, N,N-dilaurylhydroxylamine,N,N-didodecylhydroxylamine, N, N-d itetradecylhydroxylamine,N,N-dihexadecylhydroxylamine, N,N-dioctadecylhydroxylamine,N-hexadecyl-N-tetradecylhydroxylamine,N-hexadecyl-N-heptadecylhydroxylamine,N-hexadecyl-N-octadecylhydroxylamine, N-heptadecyl-N-octadecylhydroxylamine, N-methyl-N-octadecylhydroxylamineor, in certain embodiments, N,N-di(C₁₆-C₁₈alkyl)hydroxylamine.

In certain embodiments, the polyolefin comprises polyethylene (PE)homopolymers, polyethylene random or block copolymers, polypropylene(PP) homopolymers, polypropylene random or block copolymers,ethylene/propylene copolymers, a mixture of polypropylene andpolyethylene or a mixture of different types of polyethylene. In certainembodiments, the polyolefin is polypropylene. In some embodiments,polyethylene is linear low density (LLDPE), low density (LDPE), mediumdensity (MDPE) or high density (HDPE). Mixtures mentioned above are forexample PP/HDPE, PP/LDPE and LDPE/HDPE. Also included are ternarymixtures such as PP/HDPE/LLDPE. The polyolefins may be formulated withor without crosslinking.

The polyolefin composition contains for instance about 10 weight percent(wt %) polyolefin, for instance about 15 wt %, ≥about 20 wt %, ≥about 25wt %, ≥about 30 wt %, ≥about 35 wt %, ≥about 40 wt %, ≥about 45 wt %,≥about 50 wt %, ≥about 55 wt %, ≥about 60 wt %, ≥about 65 wt %, ≥about70 wt %, ≥about 75 wt %, ≥about 80 wt % or ≥about 85 wt % polyolefin,based on the weight of the composition.

Polypropylene may be a polypropylene homopolymer, a polypropylene randomcopolymer, alternating or segmented copolymer or block copolymercontaining one or more comonomers selected from the group consisting ofethylene, C₄-C₃₀-α-olefins, vinylcyclohexane, vinylcyclohexene,C₄-C₂₀alkandienes, C₅-C₁₂cycloalkandienes and norbornene derivatives;the total mol amount of propylene and the comonomer(s) being 100%.

Polypropylene copolymer also covers long chain branched polypropylenecopolymer.

Examples of suitable C₄-C₃₀α-olefins are 1-butene, 1-pentene, 1-hexene,1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene,1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene,4-methyl-1-pentene, 1-eicosene, 1-docosene, 1-tetracosene, 1-hexacosene,1-octacosene and 1-triacontene.

Examples of suitable C₄-C₂₀alkandienes include hexadiene and octadiene.Examples of suitable C₅-C₁₂cycloalkandienes include cyclopentadiene,cyclohexadiene and cyclooctadiene. Examples of suitable norbornenederivatives include 5-ethylidene-2-norbornene (ENB), dicyclopentadiene(DCP) and methylene-domethylene-hexahydronaphthaline (MEN).

A propylene/ethylene copolymer contains for example about 50% to about99.9%, in some embodiments about 80% to about 99.9% and in otherembodiments about 90% to about 99.9% by weight of propylene.

A propylene copolymer wherein the comonomer is a C₉-C₂₀α-olefin such ase.g. 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene,1-hexadecene, 1-octadecene or 1-eicosene; C₉-C₂₀alkandiene,C₉-C₁₂cycloalkandiene or a norbornene derivative such as e.g.5-ethylidene-2-norbornene (ENB) ormethylene-domethylene-hexahydronaphthaline (MEN) may contain more thanabout 90 mol %, from about 90 mol% to about 99.9 mol % or from about 90mol % to about 99 mol % propylene.

A propylene copolymer wherein the comonomer is a C₄-C₈α-olefin such ase.g. 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene or4-methyl-1-pentene; vinylcyclohexane, vinylcyclohexene, C₄-C₈alkandieneor C₅-C₈cycloalkandiene may contain more than 80 mol %, from about 80 toabout 99.9 mol % or from about 80 mol % to about 99 mol % propylene.

Further examples of polypropylene are propylene/isobutylene copolymer,propylene/butadiene copolymer, propylene/cycloolefin copolymer,terpolymers of propylene with ethylene and a diene such as hexadiene,dicyclopentadiene or ethylidene-norbornene; propylene/1-olefincopolymers where the 1-olefin is generated in situ; and propylene/carbonmonoxide copolymers.

Allyl or vinyl terminated oligomers of ethylene or propylene may beemployed as branches in polymerization reactions with propylene toprepare branched polypropylenes of high melt strength as disclosed inU.S. Pat. No. 8,399,725 and U.S. Pub. Nos. 2013/0274425, 2013/0274425,2013/0030135 and 2013/0137829.

Polypropylene's linear chain structure results in the polymer exhibitinglow melt strength and a lack of strain hardening. This can result inprocessing issues where polymer extensibility is needed. In contrast,polypropylenes exhibiting high melt strength are valued in industrialconverting operations such as blow molding, thermoforming or foaming ofpolypropylene sheet. Polypropylene based compositions of this inventionexhibit acceptable melt strength, extensibility and strain hardening toproduce extruded profiles and siding.

Advantageously, the polyolefin comprises a polypropylene homopolymer orcopolymer of a suitably high melt strength, optionally blended with apolyethylene homopolymer or copolymer. The blend may further contain athird polymer suitable to facilitate compatibility, partial miscibilityor miscibility of the different polyolefins. Such materials are referredto as interfacial tension reducing agents or compatibilizers.

Suitable compatibilizers are typically polymers that contain two or moredifferent segments each of which are miscible or compatible with theindividual components to be blended. A compatibilized polymer blend neednot be fully miscible nor satisfy all thermodynamics of mixing (e.g.resulting in a single phase, or single glass transition temperature),yet such a blend of different polymer structures will exhibit improvedresultant properties over the individual components.

One type of compatibilizer for blending of PP and PE are segmented“olefin block copolymers” or “OBC”, containing propylene, ethylene andoptionally additional alpha-olefin sequences such as those produced byDow Global Technologies and taught in U.S. Pub. Nos. 2011/032621,2011/060103, 2010/298515, 2011/054121 and 2011/015354. Included are Dowproducts under the trade name INFUSE and ExxonMobil VISTAMAXX products.These block copolymers are produced with an overall molecular weightdistribution and segment molecular weight distribution such thatMw/Mn>1.4, with two or more ethylene and alpha-olefin blocks per chainand low molecular weights (Mw<200,000 g/mol). These alternating blockcopolymers are characterized by crystallizable, rigid ‘hard block’segments and an amorphous, elastomeric ‘soft block’ content. The hardblock content ranges from 12-84 wt. % in these OBCs and total 1-octenecontent (i.e. conferring long chain branches) range from 3 to 14 wt. %.OBCs may compatibilize a blend of PP and HDPE where an increase inelongation to break and tensile strength can be achieved compared to anon compatibilized blend of HDPE and PP.

The polypropylene homopolymer or copolymer or blend with polyethyleneoptionally compatibilized may be chemically crosslinked to introducelong chain branches (LOB) off of the polypropylene main chain resultingin higher melt strength and extensibility and lower melt flow than isgenerally commercially available.

Chemical crosslinking of a polypropylene homopolymer or copolymer withanother polypropylene or with a polyethylene homo- or copolymer and/orwith a compatibilizing material is advantageous. Such crosslinkingprocesses may impart a valuable increase in polyolefin blend meltstrength, melt extensibility, mechanical and tensile strength useful inthe present extrusion processes. Such crosslinking processes ontopolypropylene may produce long chain branching (LOB) on thepolypropylene main chain and create an enhanced amount of polymer chainentanglements that results in higher polymer melt strength.

Crosslinking may be accomplished with agents such as organic peroxidesor by treatment with a radiation source such as ultraviolet light,electron beam or gamma irradiation. Radiation may be accomplished in areduced oxygen or zero oxygen environment. For instance, a polypropyleneof high melt strength and melt extensibility is obtainable by theblending of a linear polypropylene with a branched polypropylene (b-PP)in an extruder. The b-PP is prepared by reacting a peroxide with anunmodified polypropylene and optionally a bifunctional unsaturatedmonomer capable of grafting onto the unmodified polypropylene to producelong chain branches, US2015175789. In another example, U.S. Pat. Nos.5,508,318, 5,731,362, 5,591,785, 5,554,668 and 4,916,198 disclosecompounding of blends of irradiated and non-irradiated olefin polymermaterials suitable for extrusion.

In contrast to downstream extrusion or polymer chemical modification toform crosslinks or long chain branches to improve melt strength, theformation of long chain branching on polyolefins may be conductedupstream during polymer manufacture. In an example, polyethylene may bemodified in a polymerization unit via exposure to a low level of oxygen,called ‘oxygen tailoring’, resulting in formation of long chainbranching and enhanced melt strength, as taught in U.S. Pub. No.2012/100357.

The polyolefin may contain an additive that promotes a higher level ofcrystallinity upon melt converting the polymer into shaped articles.Such additives are referred to as nucleating agents.

The degree of crystallinity in polypropylene is an important parameterinfluencing properties such as modulus, yield stress, strength, etc.Within the scope of this invention is the use of nucleating agents whichinfluence the favorable formation of a degree of crystallinity thatimproves polymer melt strength during extrusion processing andimprovement of mechanical properties in the end use article. Suitablenucleating agents are for instance sodium benzoate,2,2′-methylene-bis(4,6-di-tert-butylphenyl)phosphate, zinc glycerolate,calcium salt of 1,2-dicarboxylic acid cyclohexane, aromatic trisamidecompounds, cis-endo-bicyclo[2.2.1]heptane-2,3-dicarboxylic acid disodiumsalt, aluminum hydroxy-bis[4-(tert-butyl)benzoate] and sorbitols such as1,3:2,4-bis(3,4-dimethyl-benzylidene)sorbitol1,3:2,4-bis(4-methylbenzylidene)sorbitol or1,3:2,4-bis(3,4-dimethylbenzylidene)sorbitol, as taught in U.S. Pat.Nos. 7,423,088, 7,790,793 and 8,183,312 and U.S. Pub. No. 2012/0190797.

Nucleating agents may be present for instance from about 10 parts permillion (ppm) to about 10,000 ppm, from about 12 ppm to about 1,000 ppm,from about 12 ppm to about 500 ppm or from about 12 ppm to about 300 ppmor about 400 ppm, by weight based on the weight of the polyolefin.

The polyolefin advantageously contains an inorganic (mineral) filler tobalance melt strength and extensibility or drawability to allowextrusion production of profiles and siding. Fillers are described inmore detail below.

The polyolefin comprising a polypropylene homopolymer or copolymeroptionally blended with a polyethylene homopolymer or copolymer, wherethe blend may further contain a compatibilizer may exhibit a high meltstrength. Melt strength for the polyolefin may be at least about 4centiNewtons (cN) at 210° C. For instance, the melt strength of thepolyolefin is about 4, about 5, about 6, about 7, about 8, about 9,about 10, about 11, about 12, about 13, about 14, about 15, about 16,about 17, about 18, about 19, about 20, about 21, about 22, about 23about 24 or about 25 centiNewtons at 210° C. For instance the meltstrength is about 5, ≥about 7, ≥about 9, ≥about 11, ≥about 13, ≥about15, ≥about 17, ≥about 19, ≥about 21 or ≥about 23 centiNewtons at 210° C.

Polyolefins can be prepared by the following methods:

a) radical polymerization (normally under high pressure and at elevatedtemperature) or

b) catalytic polymerization using a catalyst that normally contains oneor more than one metal of groups IVb, Vb, Vlb or VIII of the PeriodicTable. These metals usually have one or more than one ligand, typicallyoxides, halides, alcoholates, esters, ethers, amines, alkyls, alkenylsand/or aryls that may be either π- or σ-coordinated. These metalcomplexes may be in the free form or fixed on substrates, typically onactivated magnesium chloride, titanium(III) chloride, alumina or siliconoxide. These catalysts may be soluble or insoluble in the polymerizationmedium. The catalysts can be used by themselves in the polymerization orfurther activators may be used, typically metal alkyls, metal hydrides,metal alkyl halides, metal alkyl oxides or metal alkyloxanes, saidmetals being elements of groups Ia, IIa and/or IIIa of the PeriodicTable. The activators may be modified conveniently with further ester,ether, amine or silyl ether groups. These catalyst systems are usuallytermed Phillips, Standard Oil Indiana, Ziegler(-Natta), TNZ (DuPont),metallocene or single site catalysts (SSC).

Polypropylenes are produced by processes as described in literatureincluding Kissin, Y. V. (2008), Alkene Polymerization Reactions withTransition Metal Catalysts, Elsevier, pp. 207-. ISBN 978-0-444-53215-2;Hoff, Ray and Mathers, Robert T. (2010), Handbook of Transition MetalPolymerization Catalysts, John Wiley & Sons, pp. 158-ISBN978-0-470-13798-7; Moore, E. P. (1996) Polypropylene Handbook,Polymerization, Characterization, Properties, Processing, Applications,Hanser Publishers: New York, ISBN 1569902089; Benedikt, G. M. andGoodall, B. L. (eds.) (1998) Metallocene Catalyzed Polymers, ChemTechPublishing: Toronto, ISBN 978-1-884207-59-4; Malpass, D. B.,Introduction to Industrial Polyethylene, Properties, Catalysts,Processes, Wiley Publ., (2010); and Malpass, D. B., Introduction toIndustrial Polypropylene, Properties, Catalysts, Processes, Wiley Publ.,(2012).

In some embodiments, polyolefins include virgin polyolefin, polyolefinrecyclates or mixtures thereof. Polyolefin recyclates may be obtainedfrom domestic, commercial or industrial waste or from useful materialcollections. Recyclates may originate from packaging materials, forexample, films, bags, bottles and other containers or foams. It is alsopossible for polyolefins which have been previously damaged by use,storage or processing to be stabilized. These materials originate, forexample, from useful material collections or return obligations, forexample from the automobile industry, electrical/electronic industry,construction, agriculture or the textile industry.

The incorporation of the present benzofuranones and phenolicantioxidants into a polyolefin is carried out by known methods, forexample before or after molding or also by applying a dissolved ordispersed additive mixture to the polyolefin, with or without subsequentevaporation of the solvent. Present benzofuranones and phenolicantioxidants can also be added to a polyolefin in the form of amasterbatch which contains the additives in a concentration of, forexample, about 2% to about 40% by weight, based on the total weight ofthe masterbatch. In the form of a masterbatch, the polymer of themasterbatch need not be the same as the polyolefin. Molding may becarried out with known mixing machines, for instance mixers, kneaders orextruders.

Present benzofuranones and phenolic antioxidants can be premixed oradded individually. Present benzofuranones and phenolic antioxidants canalso be added before or during the polymerization or beforecrosslinking. Present benzofuranones and phenolic antioxidants can beincorporated into a polyolefin in pure form or encapsulated in waxes,oils or polymers.

Present benzofuranones and phenolic antioxidants can also be sprayedonto a polyolefin. They are able to dilute other additives or theirmelts so that they may be sprayed also together with these additivesonto a polyolefin.

In certain embodiments, the present benzofuranone additives and phenolicantioxidants are incorporated into a polyolefin by melt blending in anextruder. The present benzofuranones and phenolic antioxidants may beadded together or separately.

In some embodiments, a process of preparing a polyolefin compositionincludes measurement of raw materials by weight followed by the dryblending of raw ingredients. The mixture may be fed to a screw extruderat a constant feed rate to extrude the material into a desired form,followed by water cooling and drying.

Also subject of the invention are articles, e.g. shaped articles,comprising the present polyolefin compositions. Examples of shapedarticles include and are not limited to those listed in items I-1)through IIV-8).

-   I-1) Floating devices, marine applications, pontoons, buoys, plastic    or composite lumber for decks or piers, boats, kayaks, oars and    beach reinforcements.-   I-2) Automotive applications, interior applications, exterior    applications, for example bumpers, dashboards, battery, rear and    front linings, moldings parts under the hood, hat shelf, trunk    linings, interior linings, air bag covers, electronic moldings for    fittings (lights), panes for dashboards, headlamp glass, instrument    panel, exterior linings, upholstery, automotive lights, head lights,    parking lights, rear lights, stop lights, interior and exterior    trims; door panels; gas tank; glazing front side; rear windows; seat    backing, exterior panels, wire insulation, profile extrusion for    sealing, cladding, pillar covers, chassis parts, exhaust systems,    fuel filter/filler, fuel pumps, fuel tank, body side moldings,    convertible tops, exterior mirrors, exterior trim,    fasteners/fixings, front end module, glass, hinges, lock systems,    luggage/roof racks, pressed/stamped parts, seals, side impact    protection, sound deadener/insulator and sunroof.-   I-3) Road traffic devices, for example sign postings, posts for road    marking, car accessories, warning triangles, medical cases, helmets,    tires.-   I-4) Devices for plane, railway, motor car (car, motorbike, trucks)    including furnishings.-   I-5) Devices for space applications, for instance rockets and    satellites, e.g. reentry shields.-   I-6) Devices for architecture and design, mining applications,    acoustic quietized systems, street refuges and shelters.-   II-1) Appliances, cases and coverings in general and    electric/electronic devices (personal computer, telephone, portable    phone, printer, television-sets, audio and video devices), flower    pots, satellite TV bowl and panel devices.-   II-2) Jacketing for other materials such as steel or textiles.-   II-3) Devices for the electronic industry, for example insulation    for plugs, especially computer plugs, cases for electric and    electronic parts, printed boards and materials for electronic data    storage such as chips, check cards or credit cards.-   II-4) Electric appliances, for example washing machines, tumblers,    ovens (microwave oven), dish-washers, mixers and irons.-   II-5) Covers for lights (e.g. street-lights, lamp-shades).-   II-6) Applications in wire and cable (semi-conductor, insulation and    cable-jacketing).-   II-7) Foils for condensers, refrigerators, heating devices, air    conditioners, encapsulating of electronics, semi-conductors, coffee    machines and vacuum cleaners.-   III-1) Technical articles such as cogwheel (gear), slide fittings,    spacers, screws, bolts, handles and knobs.-   III-2) Rotor blades, ventilators and windmill vanes, solar devices,    swimming pools, swimming pool covers, pool liners, pond liners,    closets, wardrobes, dividing walls, slat walls, folding walls,    roofs, shutters (e.g. roller shutters), fittings, connections    between pipes, sleeves and conveyor belts.-   III-3) Sanitary articles, for example shower cubicles, lavatory    seats, covers and sinks.-   III-4) Hygienic articles, for instance diapers (babies, adult    incontinence), feminine hygiene articles, shower curtains, brushes,    mats, tubs, mobile toilets, tooth brushes and bed pans.-   III-5) Pipes (cross-linked or not) for water, waste water and    chemicals, pipes for wire and cable protection, pipes for gas, oil    and sewage, guttering, down pipes and drainage systems.-   III-6) Profiles of any geometry (window panes) and siding.-   III-7) Glass substitutes, for example extruded or co-extruded    plates, glazing for buildings (monolithic, twin or multiwall),    aircraft, schools, extruded sheets, window film for architectural    glazing, train, transportation, sanitary articles and greenhouse.-   III-8) Plates (walls, cutting board), extrusion-coating    (photographic paper, tetrapack and pipe coating), silos, wood    substitute, plastic lumber, wood composites, walls, surfaces,    furniture, decorative foil, floor coverings (interior and exterior    applications), flooring, duck boards and tiles.-   III-9) Intake and outlet manifolds.-   III-10) Cement-, concrete-, composite-applications and covers,    siding and cladding, hand rails, banisters, kitchen work tops,    roofing, roofing sheets, tiles and tarpaulins.-   IV-1) Plates (walls and cutting board), trays, artificial grass,    synthetic (such as Astro-Turf®), artificial covering for stadium    rings (athletics), artificial floor for stadium rings (athletics)    and tapes.-   IV-2) Woven fabrics continuous and staple, fibers (carpets/hygienic    articles/geotextiles/monofilaments; filters; wipes/curtains    (shades)/medical applications), bulk fibers (applications such as    gown/protection clothes), nets, ropes, cables, strings, cords,    threads, safety seat-belts, clothes, underwear, gloves; boots;    rubber boots, intimate apparel, garments, swimwear, sportswear,    umbrellas (parasol, sunshade), parachutes, paraglides, sails,    “balloon-silk”, camping articles, tents, airbeds, sun beds, bulk    bags and bags. Non-woven fabrics such as medical fabrics and related    apparel, industrial apparel, outdoor fabrics, in-home furnishing and    construction fabrics.-   IV-3) Membranes, insulation, covers and seals for roofs, tunnels,    dumps, ponds, dumps, walls roofing membranes, geomembranes, swimming    pools, curtains (shades)/sun-shields, awnings, canopies, wallpaper,    food packing and wrapping (flexible and solid), medical packaging    (flexible & solid), airbags/safety belts, arm- and head rests,    carpets, center console, dashboard, cockpits, door, overhead console    module, door trim, headliners, interior lighting, interior mirrors,    parcel shelf, rear luggage cover, seats, steering column, steering    wheel, textiles and trunk trim.-   V) Films (packaging, dump, laminating, agriculture and horticulture    (greenhouse covers, tunnel, low walk-in tunnel, high tunnel, mulch,    silage, silo-bags, silo-stretch, fumigation, air bubble, keder,    solawrap, thermal, bale wrap, nursery, film tubes), greenhouse,    mulch, tunnel, silage), bale wrap, swimming pools, waste bags,    wallpaper, stretch film, raffia, desalination film, batteries and    connectors. Films may have a mono-layer structure or a multi-layer    structure, for example three, five or seven layers. Examples include    film structures represented by A-B-A, A-B-C, A-B-C-B-A, A-B-C-B-D,    A-B-C-D-C-B-A, A-A-B-C-B-A-A, wherein A, B, C and D represent    different polymers or tackifiers. Layers may also be arranged to    provide films having an even number of layers, i.e. two, four or six    layers such as A-A-B-A, A-A-B-B, A-A-B-A-A, A-B-B-A-A, A-A-B-C-B,    A-A-B-C-A-A and the like.-   VI-1) Food packing and wrapping (flexible and solid), bottles.-   VI-2) Storage systems such as boxes (crates), luggage, chest,    household boxes, pallets, shelves, tracks, screw boxes, packs and    cans.-   VI-3) Cartridges, syringes, medical applications, containers for any    transportation, waste baskets and waste bins, waste bags, bins, dust    bins, bin liners, wheely bins, container in general, tanks for    water/used water/chemistry/gas/oil/gasoline/diesel; tank liners,    boxes, crates, battery cases, troughs, medical devices such as    piston, ophthalmic applications, diagnostic devices and packing for    pharmaceuticals blister.-   VII-1) Extrusion coating (photo paper, tetrapack, pipe coating),    household articles of any kind (e.g. appliances, thermos    bottle/clothes hanger), fastening systems such as plugs, wire and    cable clamps, zippers, closures, locks and snap-closures.-   VII-2) Support devices, articles for the leisure time such as sports    and fitness devices, gymnastics mats, ski-boots, inline-skates,    skis, big foot, athletic surfaces (e.g. tennis grounds); screw tops,    tops and stoppers for bottles and cans.-   VII-3) Furniture in general, foamed articles (cushions, impact    absorbers), foams, sponges, dish clothes, mats, garden chairs,    stadium seats, tables, couches, toys, building kits    (boards/figures/balls), playhouses, slides and play vehicles.-   VII-4) Materials for optical and magnetic data storage.-   VII-5) Kitchen ware (eating, drinking, cooking, storing).-   VII-6) Boxes for CD's, cassettes and video tapes; DVD electronic    articles, office supplies of any kind (ball-point pens, stamps and    ink-pads, mouse, shelves, tracks), bottles of any volume and content    (drinks, detergents, cosmetics including perfumes) and adhesive    tapes.-   VII-7) Footwear (shoes/shoe-soles), insoles, spats, adhesives,    structural adhesives, food boxes (fruit, vegetables, meat, fish),    synthetic paper, labels for bottles, couches, artificial joints    (human), printing plates (flexographic), printed circuit boards and    display technologies.-   VII-8) Devices of filled polymers (talc, chalk, china clay (kaolin),    wollastonite, pigments, carbon black, TiO₂, mica, nanocomposites,    dolomite, silicates, glass, asbestos).

In certain embodiments, a shaped article is a film, pipe, profile,bottle, tank, container or fiber. The shaped articles may be prepared bymolding, for instance injection molding, blow molding, compressionmolding, rotomolding, slush-molding or extrusion molding.

The methods and compositions of the present invention provide forexcellent color performance and enhanced thermal stability ofpolyolefins during melt processing. Melt processing stability may beexhibited by improved retention of molecular weight and maintenance ofpolymer molecular architecture.

The articles “a” and “an” herein refer to one or to more than one (e.g.at least one) of the grammatical object. Any ranges cited herein areinclusive. The term “about” used throughout is used to describe andaccount for small fluctuations. For instance, “about” may mean thenumeric value may be modified by ±5%, ±4%, ±3%, ±2%, ±1%, ±0.5%, ±0.4%,±0.3%, ±0.2%, ±0.1% or ±0.05%. All numeric values are modified by theterm “about” whether or not explicitly indicated. Numeric valuesmodified by the term “about” include the specific identified value. Forexample “about 5.0” includes 5.0.

U.S. patents, U.S. patent applications and published U.S. patentapplications discussed herein are hereby incorporated by reference.

Unless otherwise indicated, all parts and percentages are by weight.Weight percent (wt %), if not otherwise indicated, is based on an entirecomposition free of any volatiles.

EXAMPLES

The following additives are employed in the Examples; AO1-AO7 arehindered phenolic antioxidants, pentaerythritoltetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (AO1);octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate (AO2); calciumsalt of the monoethyl ester of3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid (AO3);p-(3,5-di-tert-butyl-4-hydroxyphenyhpropionic acid esters,tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate (AO4);1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene(AO5); 1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazine(AO6); alpha-tocopherol (AO7). Phos1 is an organophosphorus stabilizer,tris(2,4-di-tert-butylphenyl) phosphite.

Additive loadings are in ppm (parts per million) by weight, based on theweight of the polymer. Where total amount of phosphorus (P) is listedwith the formulations, this is also reported in ppm by weight, based onthe weight of the polymer.

Polymer plaques are tested for color development according to ASTM-313with a DCI SF600 spectrophotometer; large area view; spectral componentincluded; 2 degree observer. Color is expressed as yellowness index(YI).

Melt flow rate retentions are determined for polymer samples from thezero pass and fifth pass extrudate. Melt flow rate is performedaccording to ASTM-1238 on a Tinius-Olsen Extrusion Plastometer at 190°C.; 2.16 kg; measured in grams of polymer that flow out of a definedorifice in 10 minutes.

Oxidative Induction Time (OIT) is a measure of oxidative stability ofthe polymer. OIT is measured with a differential scanning calorimeter(DSC). Scans are collected using a heating rate of 10° C./minute undernitrogen from 50° C. to 190° C., switching to oxygen and holding atisothermal conditions until catastrophic oxidation. Time to onset ofcatastrophic oxidation (observed as a strong exotherm) is reported inminutes.

Example 1 zn-LLDPE

Blown film grade Ziegler-Natta linear low density polyethylene(zn-LLDPE) is formulated with additives listed below.

-   1) 413 ppm Phos1; 450 ppm 4/5 weight ratio of AO1/AO2; 138 ppm    benzofuranone (109); 20 ppm P-   2) 413 ppm Phos1; 450 ppm AO3; 138 ppm benzofuranone (109); 25 ppm P

Additives are blended with granular polymer free of any stabilizationadditives. In addition to the additives listed, all formulations areblended with 840 ppm zinc oxide. Thoroughly blended formulations aremelt compounded in a twin screw extruder at 210° C. under nitrogen. Thecompounded formulations are extruded multiple times in a single screwextruder fitted with a Maddock mixing section at 260° C., open to air.Pelletized samples of the third pass extrudate are compression moldedinto 3.2 mm plaques. Results are below.

melt flow melt flow formulation YI (zero pass) (fifth pass) OIT 1 3.32.04 1.69 128 2 1.3 2.05 1.66 46

Example 2 zn-PP

Fiber grade Ziegler-Natta polypropylene homopolymer (zn-PP) isformulated with additives listed below.

1) 375 ppm Phos1; 500 ppm AO1; 125 ppm benzofuranone (109); 22 ppm P

2) 375 ppm Phos1; 500 ppm AO2; 125 ppm benzofuranone (109); 22 ppm P

3) 375 ppm Phos1; 500 ppm AO4; 125 ppm benzofuranone (109); 22 ppm P

4) 375 ppm Phos1; 500 ppm AO5; 125 ppm benzofuranone (109); 22 ppm P

5) 375 ppm Phos1; 500 ppm AO3; 125 ppm benzofuranone (109); 22 ppm P

6) 375 ppm Phos1; 500 ppm AO6; 125 ppm benzofuranone (109); 22 ppm P

7) 375 ppm Phos1; 500 ppm AO7; 125 ppm benzofuranone (109); 22 ppm P

Additives are blended with granular polymer free of any stabilizationadditives. In addition to the additives listed, all formulations areblended with 500 ppm calcium stearate. Thoroughly blended formulationsare melt compounded in a twin screw extruder at 210° C. under nitrogen.Pelletized samples are compression molded into 3.2 mm plaques. Resultsare below.

melt flow melt flow formulation YI (zero pass) (fifth pass) OIT 1 6.015.01 20.30 24 2 5.4 14.11 20.56 14 3 5.9 14.77 19.65 11 4 5.6 14.8921.61 19 5 6.7 16.17 24.08 7 6 5.3 15.52 21.52 16 7 19.1 13.09 16.24 61

What is claimed is:
 1. A composition comprising: i) a polyolefin; ii)one or more benzofuranone compounds selected from the group consistingof formula I-p1 and I-o1:

wherein a) X is P=O; b) at least one of Y^(p) or Y^(o) is oxygen orrepresents a covalent bond, wherein I) when at least one of Y^(p) orY^(o) is oxygen, R^(1p) represents one of subformulae II-p, II-o orII-m:

R^(1o)represents one of subformulae II-o or II-m, or R^(1p)together withR^(2p)or R^(1o)together with R^(2o) represent one of subformulae III, IVor V:

or R^(1p) or R^(1o) is C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl,C₁-C₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl,C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, orC₂-C₁₆-alkyl, which is interrupted by one sulfur atom, R^(2p) representsone of subformulae II-p, II-o or II-m, R^(2o) represents one ofsubformulae II-o or II-m, or R^(2p) together with R^(1p) or R^(2o)together with R^(1o) represent one of subformulae III, IV or V, or R² orR^(2o) is C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, C₁-C₁₈-alkyl,C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl, C₂-C₃₀-alkyl, whichis interrupted by one or more oxygen atoms, or C₂-C₁₆-alkyl, which isinterrupted by one sulfur atom; or II) when at least one of Y^(p) orY^(o) represents a covalent bond, R^(1p) represents one of subformulaeII-p, II-o or II-m, R^(1o) represents one of subformulae II-o or II-m,or R^(1p i)or R^(1o) is C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl,C₁-C₁₈-alkyl, C₃-C₁₆-cycloalkyl, C₇-C₁₃-aralkyl, C₂-C₁₈-alkenyl,C₂-C₃₀-alkyl, which is interrupted by one or more oxygen atoms, orC₂-C₁₆-alkyl, which is interrupted by one sulfur atom, and R^(2p) orR^(2o) is C₆-C₁₀-aryl, which is unsubstituted or substituted byC₁-C₈-alkyl, C₁-C₈-alkoxy, halogen or one phenyl, or halogen; and c) R⁴,R⁵, R⁶ and R⁷ are each independently hydrogen or C₁-C₈-alkyl, R^(p2),R^(p3), R^(p5) and R^(p6) are each independently hydrogen orC₁-C₈-alkyl, R^(o1), R^(o2), R^(o5) and R^(o6) are each independentlyhydrogen or C₁-C₈-alkyl, R^(m1),R^(m3) , R^(m5) and R^(m6) are eachindependently hydrogen or C₁-C₈-alkyl, R^(a1), R^(a2), R^(a3) and R^(a4)are each independently hydrogen or C₁-C₈-alkyl, R^(b1), R^(b2), R^(b3),R^(b4), R^(b5) and R^(b6) are each independently hydrogen orC₁-C₈-alkyl, and R^(c1), R^(c2), R^(c3) and Rc⁴ are each independentlyhydrogen or C₁-C₈-alkyl; and iii) one or more hindered phenolicantioxidants.
 2. The composition according to claim 1, wherein thepolyolefin comprises polypropylene.
 3. The composition according toclaim 1, wherein the polyolefin comprises polyethylene.
 4. Thecomposition according to claim 1, wherein the one or more hinderedphenolic antioxidants is selected from the group consisting oftris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate,1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, acalcium salt of a monoethyl ester of3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid,1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl) hydrazine,pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate,N,N′-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamamide),1,3,5-tris-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, 2,2′-methylenebis(4-methyl-6-tert-butylphenol)monoacrylate and alpha-tocopherol.
 5. Thecomposition according to claim 1, wherein the one or more hinderedphenolic antioxidants is selected from the group consisting oftris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate,1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, acalcium salt of a monoethyl ester of3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid,1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazine,alpha-tocopherol, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and octadecyl3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.
 6. The compositionaccording to claim 1, wherein the one or more hindered phenolicantioxidants comprises pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl 3 -(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, or a combination thereof. 7.The composition according to claim 1, further comprising one or morecompounds selected from the group consisting of organophosphorusstabilizers.
 8. The composition according to claim 1, further comprisingone or more organophosphorus stabilizers selected from the groupconsisting of tris-nonylphenyl phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-di-tert-butyl-6-methylphenyl) ethylphosphite, 2,2′,2″-nitrilo[triethyltris(3,3′5,5′-tetra-tut-butyl-1,1′-biphenyl-2,2′-diyl) phosphite],bis(2,4-di-α-cumylphenyl) pentaerythrtitol diphosphite andtris(2,4-di-tert-butylphenyl) phosphite.
 9. The composition according toclaim 1, wherein the one or more benzofuranone compounds are presentfrom about 20 ppm to about 1000 ppm by weight, based on the weight ofthe polyolefin.
 10. The composition according to claim 1, wherein theone or more hindered phenolic antioxidants are present from about 20 ppmto about 1000 ppm by weight, based on the weight of the polyolefin. 11.The composition according to claim 1, wherein a weight/weight ratio ofthe one or more benzofuranone compounds to the one or more hinderedphenolic antioxidants is from about 0.05 to about 1.0.
 12. Thecomposition according to claim 1, wherein R⁴ and R⁶ are hydrogen, R^(p2)and R^(p6) are each independently hydrogen or C₁-alkyl, R^(p3) andR^(p5) are each independently hydrogen or C₁-C₄-alkyl, R^(o2) ishydrogen or C₁-alkyl, R^(o5) is hydrogen or C₁-C₄-alkyl, R^(a1), R^(a2),R^(a3) and R^(a4) are each independently hydrogen or C₁-C₄-alkyl andR^(b1), R^(b2), R^(b3), R^(b4), R^(b5) and R^(b6) are each independentlyhydrogen or C₁-C₄-alkyl and R^(c1), R^(c2), R^(c3) and R^(c4) are eachindependently hydrogen or C₁-C₄-alkyl.
 13. The composition according toclaim 1, wherein I) when at least one of Y^(p) or Y^(o) is oxygen,R^(1p) represents one of subformulae II-p, II-o or II-m, R^(1o)represents one of subformulae II-o or II-m, or R^(1p) together withR^(2p) or R^(1o) together with R^(2o) represent one of subformulae III,IV or V, or R^(1p) or R^(1o) is C₆-C₁₀-aryl, which is unsubstituted orsubstituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl and R^(2p)represents one of subformulae II-p, II-o or II-m, R^(2o) represents oneof subformulae II-o or II-m, or R^(2p) together with R^(1p) or R^(2o)together with R^(1o) represent one of subformulae III, IV or V, orR^(2p) and R^(2o) are C₆-C₁₀-aryl, which is unsubstituted or substitutedby C₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl; or II) when at leastone of Y^(p) or Y^(o) represents a covalent bond, R^(1p) represents oneof subformulae II-p, II-o or II-m, R^(1o) represents one of subformulaeII-o or II-m, or R^(1p) or R^(1o)is C₆-C₁₀-aryl, which is unsubstitutedor substituted by C₁-C₈-alkyl, C₁-C₁₈-alkyl or C₃-C₁₆-cycloalkyl andR^(2p) or R^(2o) is C₆-C₁₀-aryl, which is unsubstituted or substitutedby C₁-C₈-alkyl or fluoro.
 14. The composition according to claim 1,wherein at least one of Y^(p) or Y^(o) is oxygen or represents acovalent bond; when at least one of Y^(p) or Y^(o) is oxygen, R^(1p) orR^(2p), or R^(1o) or R^(2o)does not represent subformula II-m; when atleast one of Y^(p) or Y^(o) represents a covalent bond, R^(1p) or R^(1o)does not represent subformula II-m.
 15. The composition according toclaim 1, wherein at least one of Y^(p) or Y^(o) is oxygen, R^(1p)together with R^(2p) or R^(1o) together with R^(2o) represent one ofsubformulae III, IV or V, R⁴, R⁵, R⁶ and R⁷ are each independentlyhydrogen or C₁-C₈-alkyl, R^(p2), R^(p3), R^(p5) and R^(p6) are eachindependently hydrogen or C₁-C₈-alkyl, R^(o1), R^(o2), R^(o5) and R^(o6)are each independently hydrogen or C₁-C₈-alkyl, R^(a1), R^(a2), R^(a3)and R^(a4) are each independently hydrogen or C₁-C₈-alkyl, R^(b1),R^(b2), R^(b3), R^(b4), R^(b5) and R^(b6) are each independentlyhydrogen or C₁-C₈-alkyl and R^(c1), R^(c2), R^(c3) and R^(c4) are eachindependently hydrogen or C₁-C₈-alkyl.
 16. A shaped article comprisingthe composition according to claim
 1. 17. A method of preparing theshaped article according to claim 16, the method comprising meltblending the composition.
 18. An additive composition comprising ii) oneor more benzofuranone compounds according to claim 1 and iii) one ormore hindered phenolic antioxidants.
 19. The additive compositionaccording to claim 18, wherein a weight/weight ratio of the one or morebenzofuranone compounds to the one or more hindered phenolicantioxidants is from about 0.05 to about 1.0.
 20. A method ofstabilizing a polyolefin against deleterious effects of heat, light andoxygen, the method comprising incorporating into the polyolefin ii) oneor more benzofuranone compounds according to claim 1 and iii) one ormore hindered phenolic antioxidants.